FR726873A - Perfectionnements aux systèmes téléphoniques - Google Patents

Perfectionnements aux systèmes téléphoniques

Info

Publication number
FR726873A
FR726873A FR726873DA FR726873A FR 726873 A FR726873 A FR 726873A FR 726873D A FR726873D A FR 726873DA FR 726873 A FR726873 A FR 726873A
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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
Other languages
English (en)
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24138121&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=FR726873(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Application granted granted Critical
Publication of FR726873A publication Critical patent/FR726873A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
FR726873D 1931-05-11 1931-11-24 Perfectionnements aux systèmes téléphoniques Expired FR726873A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US536342A US1888337A (en) 1931-05-11 1931-05-11 Telephone system

Publications (1)

Publication Number Publication Date
FR726873A true FR726873A (fr) 1932-06-04

Family

ID=24138121

Family Applications (1)

Application Number Title Priority Date Filing Date
FR726873D Expired FR726873A (fr) 1931-05-11 1931-11-24 Perfectionnements aux systèmes téléphoniques

Country Status (3)

Country Link
US (1) US1888337A (fr)
FR (1) FR726873A (fr)
GB (1) GB388752A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735892A (en) * 1956-02-21 Party line
US2534850A (en) * 1945-04-04 1950-12-19 Bell Telephone Labor Inc Telephone system having preset transmitter
GB635644A (en) * 1947-11-26 1950-04-12 Siemens Brothers & Co Ltd Improvements relating to telephone systems
US2824909A (en) * 1952-09-13 1958-02-25 Gen Telephone Lab Inc Telephone system
US2831065A (en) * 1956-03-29 1958-04-15 Gen Dynamics Corp Conference circuit
US3041406A (en) * 1959-12-14 1962-06-26 Gen Dynamics Corp Inward dialing to private branch exchange

Also Published As

Publication number Publication date
GB388752A (en) 1933-02-28
US1888337A (en) 1932-11-22

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