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NO167541B - EQUIPMENT Nozzle device. - Google Patents

EQUIPMENT Nozzle device. Download PDF

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Publication number
NO167541B
NO167541B NO892857A NO892857A NO167541B NO 167541 B NO167541 B NO 167541B NO 892857 A NO892857 A NO 892857A NO 892857 A NO892857 A NO 892857A NO 167541 B NO167541 B NO 167541B
Authority
NO
Norway
Prior art keywords
ejector
ejector nozzle
nozzle
fertilizer
air intake
Prior art date
Application number
NO892857A
Other languages
Norwegian (no)
Other versions
NO892857D0 (en
NO892857L (en
NO167541C (en
Inventor
Svein Tegle
Original Assignee
Svein Tegle
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Svein Tegle filed Critical Svein Tegle
Priority to NO892857A priority Critical patent/NO167541C/en
Publication of NO892857D0 publication Critical patent/NO892857D0/en
Priority to DE4100480A priority patent/DE4100480C2/en
Publication of NO892857L publication Critical patent/NO892857L/no
Publication of NO167541B publication Critical patent/NO167541B/en
Publication of NO167541C publication Critical patent/NO167541C/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C3/00—Treating manure; Manuring
    • A01C3/02—Storage places for manure, e.g. cisterns for liquid manure; Installations for fermenting manure
    • A01C3/026—Storage places for manure, e.g. cisterns for liquid manure; Installations for fermenting manure with mixing or agitating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B01F23/2326—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles adding the flowing main component by suction means, e.g. using an ejector
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F3/00—Fertilisers from human or animal excrements, e.g. manure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock
    • Y02P20/145—Feedstock the feedstock being materials of biological origin

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Biotechnology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microbiology (AREA)
  • Molecular Biology (AREA)
  • Environmental Sciences (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Fertilizers (AREA)
  • Nozzles (AREA)

Description

Denne oppfinnelse vedrører en anordning ved ejektordyse i ejektor for innblanding av luft i flytende naturgjødsel i våtkomposteringskunimer, og av den art som er nærmere angitt i etterfølgende patentkrav 1. This invention relates to a device at the ejector nozzle in the ejector for mixing air into liquid natural fertilizer in wet composting bins, and of the kind that is specified in subsequent patent claim 1.

Ved våtkompostering av naturgjødsel i kummer er det for be-varing av våtgjødselens nitrogeninnhold av den aller største betydning å kunne blande inn luft i våtkomposten. Luftinn-blandingen er kritisk med hensyn på innsuget luftmengde per tidsenhet, finfordelingen av luftboblene samt deres fordeling i gjødselsmassen. When wet composting natural manure in basins, it is of the utmost importance to be able to mix air into the wet compost to preserve the nitrogen content of the wet manure. The air intake mixture is critical with regard to the amount of air sucked in per unit of time, the fine distribution of the air bubbles and their distribution in the fertilizer mass.

Ved kjente anlegg av denne art suges luft inn i bløt-gjødselen via en nedsenket ejektor med et hus som er utformet med en oppadrettet luftinnsugningsrørstuss, idet det i ejektorhuset frembringes en sugevirkning ved hjelp av en ejektordyse som mates med bløtgjødsel under trykk fra en pumpe. Ejektordysen munner ut i området for luftinnsugnings-rørstussen, og bløtgjødselstrålens strømningshastighet i ejektorhuset idet strålen forlater ejektordysens munningskant, gir opphav til nevnte luftinnsugningseffekt i ejektorhuset, det vil si i det område hvor luftinnsugningsrør-stussen munner ut i ejektorhuset. In known systems of this kind, air is sucked into the liquid manure via a submerged ejector with a housing that is designed with an upwardly directed air intake pipe, as a suction effect is produced in the ejector housing by means of an ejector nozzle which is fed with liquid manure under pressure from a pump. The ejector nozzle opens in the area of the air intake pipe connector, and the flow rate of the liquid fertilizer jet in the ejector housing as the jet leaves the ejector nozzle's mouth edge gives rise to the aforementioned air intake effect in the ejector housing, i.e. in the area where the air intake pipe connector opens into the ejector housing.

For å sette gjæringsprosessene i den flytende naturgjødsel igang snarest mulig for derved dels å bevare mest mulig av nitrogenet i naturgjødselen inntakt fra tidspunktet for lagring til tidspunktet for utkjøring av ferdiggjæret gjødsel, dels å forkorte gjæringsprosessen generelt for således å ha ferdiggjæret gjødsel klar for utkjøring kortest mulig tid etter lagring, er det viktig å få temperaturen opp på ca. 30 grader så snart som mulig. Korrekt lufting av gjødselen be-gunstiger nevnte temperaturstigning. Ved kjente ejektor- - innretninger lar man pumpen gå kontinuerlig inntil gjødsels-temperaturen kommer opp i 30 grader, hvoretter man går over til intermittent drift under temperaturkontroll. In order to start the fermentation processes in the liquid natural fertilizer as soon as possible, thereby partly preserving as much as possible of the nitrogen in the natural fertilizer taken in from the time of storage to the time of disposal of the fully fermented manure, and partly to shorten the fermentation process in general in order to have fully fermented manure ready for disposal in the shortest possible time possible time after storage, it is important to bring the temperature up to approx. 30 degrees as soon as possible. Correct aeration of the fertilizer favors the aforementioned temperature rise. With known ejector devices, the pump is allowed to run continuously until the fertilizer temperature reaches 30 degrees, after which it switches to intermittent operation under temperature control.

Det er kjent at flytende naturgjødsel viser en tendens til økende nitrogentap med økende luftetid når temperaturen ligger over 30 grader (gjæringstemperatur). Nitrogentapet skyldes blant annet ammoniakkfordampning. Et nitrogentap på 10-15% eller mer er helt vanlig ved kjente våtkomposterings-anlegg med lufteejektor. It is known that liquid natural fertilizers tend to increase nitrogen loss with increasing aeration time when the temperature is above 30 degrees (fermentation temperature). The nitrogen loss is due, among other things, to ammonia evaporation. A nitrogen loss of 10-15% or more is quite common in known wet composting plants with aeration ejectors.

Da nitrogen utgjør en meget viktig gjødselskomponent, er det av den største betydning å kunne redusere luftetiden så meget som er forenelig med de gjæringsprosesser den flytende naturgjødsel skal gjennomgå. As nitrogen is a very important fertilizer component, it is of the greatest importance to be able to reduce the aeration time as much as is compatible with the fermentation processes the liquid natural fertilizer must undergo.

Dette formål er realisert ved det trekk som fremgår av den karakteriserende del av patentkrav 1. This purpose is realized by the feature that appears in the characterizing part of patent claim 1.

Ejektordysen er ifølge oppfinnelsen ved munningskanten utformet med kantutsparinger som ved praktiske forsøk overraskende har vist seg å gi den effekt at luftinnsugningen optimaliseres. De fluidumdynamiske teorier for denne maksi-merte luftinnsugningseffekt er ikke fullt utredet enda, men man antar at effekten kan bero på små hvirveldelstrømmer/- turbulente radiale/aksiale kombinasjonsdelstrømmer i gjød-selsstrålens periferisjikt, iverksatt i området ved ejektordysens kantutsparinger. Ejektordysens kantutsparinger ved munningskanten sørger ikke bare for økt luftinnsugnings-mengde per tidsenhet sammenlignet med kjent teknikk, men også for en forbedret luftboblefinfordeling i gjødselmassen i form av mindre luftblærer og jevnere fordeling av disse. Resultatet er en betydelig forkortet luftetid og et vesent-lig lavere nitrogentap. According to the invention, the ejector nozzle is designed at the edge of the mouth with edge recesses which, in practical tests, have surprisingly been shown to give the effect that the air intake is optimised. The fluid dynamic theories for this maximized air intake effect have not yet been fully investigated, but it is assumed that the effect may be due to small eddy currents/turbulent radial/axial combination currents in the peripheral layer of the fertilizer jet, implemented in the area of the edge recesses of the ejector nozzle. The ejector nozzle's edge recesses at the edge of the mouth not only ensure an increased amount of air intake per time unit compared to known technology, but also for an improved air bubble fine distribution in the fertilizer mass in the form of smaller air bubbles and a more even distribution of these. The result is a significantly shortened aeration time and a significantly lower nitrogen loss.

Et utførelseseksempel av en anordning ifølge oppfinnelsen er vist på medfølgende tegning hvor eneste figur viser et aksialsnitt gjennom en ejektor for flytende naturgjødsel. An embodiment of a device according to the invention is shown in the accompanying drawing, where the only figure shows an axial section through an ejector for liquid natural fertiliser.

I tegningsfiguren er ejektorens hus betegnet med henvis-ningstallet 1. I bruksstilling vil ejektoren befinne seg nedsenket i gjødselen i en våtkomposteringskum hvor ejektoren i samvirke med en pumpe (ikke vist) har til oppgave å sørge for passende luftinnblanding i gjødselen. In the drawing, the ejector's housing is designated with the reference number 1. In the position of use, the ejector will be immersed in the manure in a wet composting basin where the ejector, in cooperation with a pump (not shown), has the task of ensuring suitable air mixing in the manure.

Ejektorhuset 1 har for dette formål en oppadrettet luft-innsugningsstuss 2. Denne er forbundet med et ikke vist rør som rager opp over gjødselnivået i våtkomposteringskummen. For this purpose, the ejector housing 1 has an upward air intake nozzle 2. This is connected to a pipe, not shown, which protrudes above the manure level in the wet composting basin.

Nevnte pumpe tar inn gjødsel fra våtkomposteringskummen og sender en gjødselsstråle gjennom ejektoren, idet gjødsels-strålens strømningsretning gjennom ejektorhuset 1 er antydet med pil P. Ejektorhuset 1 er utformet med en tilkoplings-flens 3 for tilkopling til pumpens trykkside. Selve pumpe-anordningen er ikke gjenstand for den foreliggende oppfinnelse . Said pump takes in manure from the wet composting basin and sends a jet of manure through the ejector, the direction of flow of the manure jet through the ejector housing 1 is indicated by arrow P. The ejector housing 1 is designed with a connection flange 3 for connection to the pressure side of the pump. The pump device itself is not the subject of the present invention.

I området for luftinnsugningsstussen 2 ved tilkoplingsflen-sen 3, er ejektorhuset 1 utformet med et sete 4 for en ejektordyse 5, som fortrinnsvis er utformet som særskilt del. In the area of the air intake nozzle 2 at the connection flange 3, the ejector housing 1 is designed with a seat 4 for an ejector nozzle 5, which is preferably designed as a separate part.

Ejektordysens 5 indre flate 5' forløper konisk avsmalende i gjødselsstrålens strømningsretning P og bevirker derved en i og for seg kjent hastighetsøkning/trykkminskning i strålen, hvilket gir opphav til en høyere luftinnsugningseffekt i den akselererte gjødselsstråle i området umiddelbart nedstrøms ejektordysens 5 munningskant 5", det vil si i området for luftinnsugningsrørstussen 2. Den luftiblandede gjødselstråle strømmer videre i ejektorhuset 1 via et rørstussformet parti 1' og derfra ut gjennom et gjødselsutblåsningsrør 6 festet til ejektorhuspartiet 1' . The inner surface 5' of the ejector nozzle 5 tapers conically in the direction of flow P of the fertilizer jet and thereby causes a per se known speed increase/pressure reduction in the jet, which gives rise to a higher air intake effect in the accelerated fertilizer jet in the area immediately downstream of the ejector nozzle 5's mouth edge 5", the i.e. in the area of the air intake pipe spigot 2. The air-mixed fertilizer jet flows further into the ejector housing 1 via a pipe spigot-shaped part 1' and from there out through a fertilizer discharge pipe 6 attached to the ejector housing part 1'.

Ejektordysens 5 munningskantparti er ifølge oppfinnelsen utformet med en rekke kantutsparinger 7, som i den viste ut-førelsesform har halvsirkulær omkretsform. Omkretsformen er imidlertid ikke kritisk, og det er heller ikke kantutsparin-genes antall. According to the invention, the mouth edge portion of the ejector nozzle 5 is designed with a number of edge recesses 7, which in the embodiment shown have a semicircular circumferential shape. However, the shape of the circumference is not critical, nor is the number of edge recesses.

Disse kantutsparinger 7 har som nevnt ovenfor, ved praktiske forsøk vist seg å avstedkomme en overraskende tilleggseffekt som bidrar positivt til luftinnsugningen/luftinnblan-dingen i den gjennom ejektorhuset 1 strømmende gjødsels-stråle som via utblåsningsrøret 6 sprøytes ut i våtkomposteringskummen . As mentioned above, these edge recesses 7 have, in practical tests, been shown to produce a surprising additional effect which contributes positively to the air intake/air mixing in the fertilizer jet flowing through the ejector housing 1 which is sprayed out into the wet composting basin via the exhaust pipe 6.

Ejektordysens 5 indre koniske flate 5' forløper hensikts-messig etter radialt: innad konvekst krummede generatriser, hvilket har vist seg/ å gi en positiv om enn underordnet tilleggseffekt med hensyn til optimal luftinnsugning/ The inner conical surface 5' of the ejector nozzle 5 appropriately follows radially: inwardly convexly curved generatrices, which has been shown/ to give a positive, albeit subordinate, additional effect with regard to optimal air intake/

-innblanding. -intervention.

Ejektordysen 5 omfatter et dyselegeme fremstilt av en passende elastisk plastlegering og en avstivningsring 8 av metall. Dyselegemets egenelastisitet antas å fremme den tilsiktede virkning. The ejector nozzle 5 comprises a nozzle body made of a suitable elastic plastic alloy and a stiffening ring 8 of metal. The inherent elasticity of the nozzle body is believed to promote the intended effect.

Ved den viste utførelsesform flukter ejektordysens 5 munningskant 5" med luftinnsugningsrørets 2 akse 9. Dette re-presenterer et fordelaktig men ikke essensielt trekk ved oppfinnelsen, idet ejektordysens 5 munningskant 5" kan for-flyttes frem henholdsvis tilbake i forhold til luftinnsug-ningsrørstussens 2 akseprojeksjon 9, uten at dette vil få merkbare følger for den tilsiktede luftinnsugningseffekt. Ejektordysens 5 plassering med hensyn på luftinnsugningsrør-stussen 2 er således ikke særlig kritisk, men det forutset-tes selvsagt at dysen munner ut i området umiddelbart neden-for luftinnsugningsrøret 2. In the embodiment shown, the mouth edge 5" of the ejector nozzle 5 aligns with the axis 9 of the air intake pipe 2. This represents an advantageous but not essential feature of the invention, as the mouth edge 5" of the ejector nozzle 5 can be moved forward or back in relation to the axis projection of the air intake pipe nozzle 2 9, without this having noticeable consequences for the intended air intake effect. The location of the ejector nozzle 5 with respect to the air intake pipe connection 2 is thus not particularly critical, but it is of course assumed that the nozzle opens into the area immediately below the air intake pipe 2.

Claims (5)

1. Anordning ved ejektordyse (5) i en ejektor for innblanding av luft i flytende naturgjødsel i våtkomposterings-kummer, hvilken ejektor er innrettet til å samvirke med en pumpe som mater ejektoren med gjødsel via ejektordysen (5), og hvor det i ejektorens hus (1), som er forsynt med et gjødselsutblåsningsrør (6), i området ved utløpet av ejektordysen (5) er anordnet et luftinnsugningsrør (2), karakterisert ved at ejektordysens (5) munningskantparti (5") er utformet med kantutsparinger (7).1. Device at the ejector nozzle (5) in an ejector for mixing air into liquid natural fertilizer in wet composting basins, which ejector is designed to cooperate with a pump that feeds the ejector with fertilizer via the ejector nozzle (5), and where in the ejector's housing (1), which is equipped with a fertilizer discharge pipe (6), in the area at the outlet of the ejector nozzle (5) an air intake pipe (2) is arranged, characterized in that the mouth edge part (5") of the ejector nozzle (5") is designed with edge recesses (7) . 2. Anordning i samsvar med krav 1, karakterisert ved at kantutsparingene (7) er fordelt rundt munningskantpartiets (5") omkrets med innbyrdes lik avstand, idet hver kantutsparing (7) har i hovedsak halvsirkulær omkretsform.2. Device in accordance with claim 1, characterized in that the edge recesses (7) are distributed around the circumference of the mouth edge part (5") at equal distances from each other, each edge recess (7) having an essentially semi-circular circumferential shape. 3. Anordning i samsvar med krav 1 eller 2, karakterisert ved at ejektordysens (5) munningskant (5") i det vesentlige flukter med luftinnsugningsrørets (2) akseprojeksjon (9).3. Device in accordance with claim 1 or 2, characterized in that the mouth edge (5") of the ejector nozzle (5") essentially aligns with the axial projection (9) of the air intake pipe (2). 4. Anordning i samsvar med et hvilket som helst av de fore-gående krav, hvor ejektordysens (5) indre flate (5<1>) for-løper konisk avsmalnende i gjødselsstrålens strømningsret-ning (P) gjennom ejektorhuset (1), karakterisert ved at ejektordysens (5) indre koniske flate (5') forløper langs radialt innad konvekst krummede generatriser med svak krumning.4. Device in accordance with any of the preceding claims, where the inner surface (5<1>) of the ejector nozzle (5) proceeds conically tapering in the flow direction (P) of the fertilizer jet through the ejector housing (1), characterized in that the inner conical surface (5') of the ejector nozzle (5) runs along radially inwardly convexly curved generatrices with slight curvature. 5. Anordning i samsvar med et hvilket som helst av de fore-gående krav, karakterisert ved at ejektordysen (5) består av en elastisk plastlegering som i avstand fra munningskantpartiet (5"), omsluttes av en avstivningsring (8), idet det i ejektorhuset (1) er utformet et sete (4) for opptagelse av ejektordysen via dens avstivningsring (8).5. Device according to any one of the preceding claims, characterized in that the ejector nozzle (5) consists of an elastic plastic alloy which, at a distance from the mouth edge part (5"), is surrounded by a stiffening ring (8), as in the ejector housing (1) is designed a seat (4) for receiving the ejector nozzle via its stiffening ring (8).
NO892857A 1989-07-11 1989-07-11 EQUIPMENT Nozzle device. NO167541C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NO892857A NO167541C (en) 1989-07-11 1989-07-11 EQUIPMENT Nozzle device.
DE4100480A DE4100480C2 (en) 1989-07-11 1991-01-10 Ejector for the admixture of air in liquid natural fertilizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO892857A NO167541C (en) 1989-07-11 1989-07-11 EQUIPMENT Nozzle device.

Publications (4)

Publication Number Publication Date
NO892857D0 NO892857D0 (en) 1989-07-11
NO892857L NO892857L (en) 1991-01-14
NO167541B true NO167541B (en) 1991-08-12
NO167541C NO167541C (en) 1991-11-20

Family

ID=19892225

Family Applications (1)

Application Number Title Priority Date Filing Date
NO892857A NO167541C (en) 1989-07-11 1989-07-11 EQUIPMENT Nozzle device.

Country Status (2)

Country Link
DE (1) DE4100480C2 (en)
NO (1) NO167541C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9404731U1 (en) * 1994-03-21 1994-09-01 Negele, Helfried, 86916 Kaufering Device for feeding carbon dioxide into tap water
DE4432441A1 (en) * 1994-09-12 1996-03-14 Sellmaier Horst Mixing nozzle for first and second fluids

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3309834C2 (en) * 1983-03-18 1985-10-24 Anton 8206 Bruckmühl Humpel Device for processing a liquid, in particular manure

Also Published As

Publication number Publication date
NO892857D0 (en) 1989-07-11
NO892857L (en) 1991-01-14
NO167541C (en) 1991-11-20
DE4100480C2 (en) 1999-07-01
DE4100480A1 (en) 1992-07-16

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