FR672141A - Locking device for electrical signaling systems - Google Patents

Locking device for electrical signaling systems

Info

Publication number: FR672141A
Authority: FR; France
Prior art keywords: locking device; signaling systems; electrical signaling; electrical; systems
Prior art date: 1928-03-31
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

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.)

Telefonaktiebolaget LM Ericsson AB

Original Assignee

Telefonaktiebolaget LM Ericsson AB

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.)

1928-03-31

Filing date

1929-03-27

Publication date

1929-12-23

1929-03-27 Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB

1929-12-23 Application granted granted Critical

1929-12-23 Publication of FR672141A publication Critical patent/FR672141A/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

Engineering & Computer Science (AREA)
Computer Networks & Wireless Communication (AREA)
Signal Processing (AREA)
Circuit Arrangements For Discharge Lamps (AREA)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

FR672141D 1928-03-31 1929-03-27 Locking device for electrical signaling systems Expired FR672141A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
SE308816X		1928-03-31

Publications (1)

Publication Number	Publication Date
FR672141A true FR672141A (en)	1929-12-23

Family

ID=20307588

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR672141D Expired FR672141A (en)	1928-03-31	1929-03-27	Locking device for electrical signaling systems

Country Status (7)

Country	Link
US (1)	US1958167A (en)
AT (1)	AT116983B (en)
BE (1)	BE359396A (en)
DE (2)	DE495106C (en)
FR (1)	FR672141A (en)
GB (1)	GB308816A (en)
NL (1)	NL30423C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE755785C (en) *	1933-03-16	1952-03-31	Marconi Wireless Telegraph Co	Arrangement for the automatic activation of a transmitter with the help of rectified modulation oscillations

0
- NL NL30423D patent/NL30423C/xx active
1929
- 1929-03-26 AT AT116983D patent/AT116983B/en active
- 1929-03-27 FR FR672141D patent/FR672141A/en not_active Expired
- 1929-03-27 GB GB9901/29A patent/GB308816A/en not_active Expired
- 1929-03-29 US US351027A patent/US1958167A/en not_active Expired - Lifetime
- 1929-03-29 BE BE359396D patent/BE359396A/xx unknown
- 1929-03-31 DE DET36670D patent/DE495106C/en not_active Expired
1932
- 1932-11-09 DE DET41643D patent/DE593628C/en not_active Expired

Also Published As

Publication number	Publication date
BE359396A (en)	1929-04-30
NL30423C (en)
GB308816A (en)	1930-06-12
DE495106C (en)	1930-04-03
AT116983B (en)	1930-03-25
US1958167A (en)	1934-05-08
DE593628C (en)	1934-03-02

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