ES177484A1 - A TELEPHONE SYSTEM - Google Patents

A TELEPHONE SYSTEM

Info

Publication number: ES177484A1
Authority: ES; Spain
Prior art keywords: telephone system; telephone
Prior art date: 1942-10-24
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

ES0177484A

Other languages

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.)

AT&T Corp

Original Assignee

Western Electric Co Inc

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.)

1942-10-24

Filing date

1947-03-18

Publication date

1947-05-01

1947-03-18 Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc

1947-05-01 Publication of ES177484A1 publication Critical patent/ES177484A1/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/40—Artificial lines; Networks simulating a line of certain length
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/76—Compensating for differences in line impedance

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Computer Networks & Wireless Communication (AREA)
Monitoring And Testing Of Exchanges (AREA)
Thermistors And Varistors (AREA)
Telephone Function (AREA)

ES0177484A 1942-10-24 1947-03-18 A TELEPHONE SYSTEM Expired ES177484A1 (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US463184A US2387269A (en)	1942-10-24	1942-10-24	Telephone system

Publications (1)

Publication Number	Publication Date
ES177484A1 true ES177484A1 (en)	1947-05-01

Family

ID=23839177

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
ES0177484A Expired ES177484A1 (en)	1942-10-24	1947-03-18	A TELEPHONE SYSTEM

Country Status (6)

Country	Link
US (1)	US2387269A (en)
BE (1)	BE468046A (en)
ES (1)	ES177484A1 (en)
FR (1)	FR941331A (en)
GB (1)	GB591495A (en)
NL (1)	NL64921C (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2518178A (en) *	1947-11-05	1950-08-08	Automatic Elect Lab	Antisidetone and line balancing substation circuits for telephone systems
BE485032A (en) *	1947-12-22
US2568150A (en) *	1948-06-15	1951-09-18	Bell Telephone Labor Inc	Balancing network for subscribers' telephone sets
US2604543A (en) *	1950-11-09	1952-07-22	Bell Telephone Labor Inc	Equalizer circuit
BE505815A (en) *	1950-12-27
DE886766C (en) *	1951-03-03	1953-08-17	Normalzeit G M B H	Device to prevent unauthorized eavesdropping on telephone conversations
DE1039104B (en) *	1951-04-18	1958-09-18	Int Standard Electric Corp	Circuit arrangement for telephone stations to prevent overhearing one's own speech
BE510745A (en) *	1951-04-18
DE1038118B (en) *	1951-04-26	1958-09-04	Int Standard Electric Corp	Circuit arrangement for telephone stations to prevent overhearing one's own speech and room noise
BE539848A (en) *	1954-07-16
US3119063A (en) *	1961-01-13	1964-01-21	Gen Dynamics Corp	Transmission line terminating impedance distinguishing circuit
DE1928434A1 (en) *	1969-06-04	1970-12-10	Siemens Ag	Circuit arrangement for connecting direct current data transmission systems with low transmission voltage to a data exchange
NL7805416A (en) *	1978-05-19	1979-11-21	Philips Nv	SELF-ADJUSTING FORK GEARS.
US6146056A (en) *	1998-01-14	2000-11-14	Jennmar Corporation	Channel and bearing plate assembly

0
- NL NL64921D patent/NL64921C/xx active
- BE BE468046D patent/BE468046A/xx unknown
1942
- 1942-10-24 US US463184A patent/US2387269A/en not_active Expired - Lifetime
1944
- 1944-06-02 GB GB10687/44A patent/GB591495A/en not_active Expired
1947
- 1947-01-30 FR FR941331D patent/FR941331A/en not_active Expired
- 1947-03-18 ES ES0177484A patent/ES177484A1/en not_active Expired

Also Published As

Publication number	Publication date
BE468046A (en)
FR941331A (en)	1949-01-07
US2387269A (en)	1945-10-23
NL64921C (en)
GB591495A (en)	1947-08-20

Publication	Publication Date	Title
ES177484A1 (en)	1947-05-01	A TELEPHONE SYSTEM
DK65977C (en)	1947-12-01	Plantemaskine.
DK61708C (en)	1943-12-13	Issandal.
ES158829A1 (en)	1943-03-01	A POLISHING SYSTEM
ES155740A1 (en)	1943-04-01	A TROLE
ES156195A1 (en)	1943-04-01	A GASOGEN
ES156321A1 (en)	1943-04-01	A GASOGEN
ES156467A1 (en)	1943-04-01	A PHOTOUTOMATA
ES156725A1 (en)	1943-04-01	A GASOGEN
ES157299A1 (en)	1943-03-01	A GASOGEN
ES157404A1 (en)	1943-03-01	A GASOGEN
ES158086A1 (en)	1943-03-01	A GASOGEN
ES158168A1 (en)	1943-03-01	A GASOGEN
ES158273A1 (en)	1943-03-01	A GASOGEN
ES158616A1 (en)	1943-03-01	A GASOGEN
ES159020A1 (en)	1944-01-01	A GASOGEN
ES159593A1 (en)	1943-03-01	A GASOGEN
ES159887A1 (en)	1943-05-01	A GASOGEN
FR54610E (en)	1950-07-07	Telephone system
FR929982A (en)	1948-01-13	Telephone system
DK63053C (en)	1944-12-27	Pipe connection.
CH247352A (en)	1947-02-28	Telephone installation.
CH251036A (en)	1947-09-30	Telephone installation.
CH275633A (en)	1951-05-31	Telephone installation.
CH282889A (en)	1952-05-15	Telephone installation.