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GB296070A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB296070A
GB296070A GB24447/28A GB2444728A GB296070A GB 296070 A GB296070 A GB 296070A GB 24447/28 A GB24447/28 A GB 24447/28A GB 2444728 A GB2444728 A GB 2444728A GB 296070 A GB296070 A GB 296070A
Authority
GB
United Kingdom
Prior art keywords
junction
relay
busying
wire
busy
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB24447/28A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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
Priority claimed from US175187A external-priority patent/US1775834A/en
Application filed by Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Priority claimed from US329490A external-priority patent/US1815169A/en
Publication of GB296070A publication Critical patent/GB296070A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
    • F02M2700/1305—Auxiliary air supply devices for carburettors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Exchange Systems With Centralized Control (AREA)

Abstract

296,070. Associated Telephone & Telegraph Co., (Assignees of Stehlik, R. F.). March 14, 1927, [Convention date]. Divided on 287,079. Drawings to Specification. Semi-automatic exchange systems.-One wire of an automatic-manual junction is connected to battery at the outgoing end through a relay which marks the junction busy when ground is connected to the wire at the incoming end. The relay is disconnected from the junction and energized locally when the junction is taken into use. The ground connection is effected in some cases through a winding of the line relay which is unable to pull up in series with the busying relay. The line relay is initially operated over the other wire and subsequently held over both. The busying relay is operated when a fuse blows, when all the call-indicator registers but one available to the junction are busy, when the hunting switch that associates the junction with a register is in motion, when a busying key is thrown by the operator or when the relay group in which the junction terminates is being tested. The system described is identical with that described in Specification 287,079.
GB24447/28A 1927-03-14 1928-01-12 Improvements in or relating to telephone systems Expired GB296070A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US296069XA 1927-03-14 1927-03-14
US296070XA 1927-03-14 1927-03-14
US175187A US1775834A (en) 1927-03-14 1927-03-14 Multioffice telephone system
US329490A US1815169A (en) 1927-03-14 1928-12-31 Multioffice telephone system

Publications (1)

Publication Number Publication Date
GB296070A true GB296070A (en) 1929-04-12

Family

ID=27487764

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1107/28A Expired GB287079A (en) 1927-03-14 1928-01-12 Improvements in or relating to telephone systems
GB24447/28A Expired GB296070A (en) 1927-03-14 1928-01-12 Improvements in or relating to telephone systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1107/28A Expired GB287079A (en) 1927-03-14 1928-01-12 Improvements in or relating to telephone systems

Country Status (1)

Country Link
GB (2) GB287079A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665068A (en) * 1984-11-17 1987-05-12 Tanabe Seiyaku Co., Ltd. Novel 9-chloro-1,5-benzothiazepine derivatives and their pharmaceutical use

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665068A (en) * 1984-11-17 1987-05-12 Tanabe Seiyaku Co., Ltd. Novel 9-chloro-1,5-benzothiazepine derivatives and their pharmaceutical use

Also Published As

Publication number Publication date
GB287079A (en) 1929-02-07

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