BE484800A - - Google Patents

Info

Publication number
BE484800A
BE484800A BE484800DA BE484800A BE 484800 A BE484800 A BE 484800A BE 484800D A BE484800D A BE 484800DA BE 484800 A BE484800 A BE 484800A
Authority
BE
Belgium
Application number
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.)
Publication of BE484800A publication Critical patent/BE484800A/xx

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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
BE484800D 1947-09-12 BE484800A (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
BE484800A true BE484800A (fr)

Family

ID=25098795

Family Applications (1)

Application Number Title Priority Date Filing Date
BE484800D BE484800A (fr) 1947-09-12

Country Status (4)

Country Link
US (1) US2549719A (fr)
BE (1) BE484800A (fr)
FR (1) FR970914A (fr)
GB (1) GB685832A (fr)

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 (fr) * 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
GB685832A (en) 1953-01-14
US2549719A (en) 1951-04-17
FR970914A (fr) 1951-01-10

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