FR970914A - Système téléphonique d'intercommunication - Google Patents

Système téléphonique d'intercommunication

Info

Publication number
FR970914A
FR970914A FR970914DA FR970914A FR 970914 A FR970914 A FR 970914A FR 970914D A FR970914D A FR 970914DA FR 970914 A FR970914 A FR 970914A
Authority
FR
France
Prior art keywords
intercom system
telephone intercom
telephone
intercom
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)
French (fr)
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories 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.)
Filing date
Publication date
Application filed by Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Application granted granted Critical
Publication of FR970914A publication Critical patent/FR970914A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
FR970914D 1947-09-12 1948-08-30 Système téléphonique d'intercommunication Expired FR970914A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US773609A US2549719A (en) 1947-09-12 1947-09-12 Executive's and secretary's trunk connective intercommunication and signal system

Publications (1)

Publication Number Publication Date
FR970914A true FR970914A (fr) 1951-01-10

Family

ID=25098795

Family Applications (1)

Application Number Title Priority Date Filing Date
FR970914D Expired FR970914A (fr) 1947-09-12 1948-08-30 Système téléphonique d'intercommunication

Country Status (4)

Country Link
US (1) US2549719A (en:Method)
BE (1) BE484800A (en:Method)
FR (1) FR970914A (en:Method)
GB (1) GB685832A (en:Method)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682576A (en) * 1951-01-20 1954-06-29 Irving H Selden Telephone system
US2850578A (en) * 1954-05-12 1958-09-02 Gen Dynamics Corp Telephone answering and intercept circuit
BE539028A (en:Method) * 1954-08-23
US3003038A (en) * 1957-10-03 1961-10-03 Gen Dynamics Corp Multiple station intercommunication system
US3435151A (en) * 1965-12-28 1969-03-25 Int Standard Electric Corp Arrangement of branched telephone subsets
US3668290A (en) * 1970-07-22 1972-06-06 Bell Telephone Labor Inc Combination coin telephone and extension circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2027197A (en) * 1934-11-17 1936-01-07 Bell Telephone Labor Inc Trunk circuit
US2095712A (en) * 1936-02-03 1937-10-12 Associated Electric Lab Inc Telephone system
US2303015A (en) * 1941-09-27 1942-11-24 Bell Telephone Labor Inc Emergency conference circuit
US2374072A (en) * 1943-01-12 1945-04-17 Bell Telephone Labor Inc Telephone system

Also Published As

Publication number Publication date
BE484800A (en:Method)
GB685832A (en) 1953-01-14
US2549719A (en) 1951-04-17

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