FR939445A - Telephone systems - Google Patents

Telephone systems

Info

Publication number
FR939445A
FR939445A FR939445DA FR939445A FR 939445 A FR939445 A FR 939445A FR 939445D A FR939445D A FR 939445DA FR 939445 A FR939445 A FR 939445A
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
French (fr)
Inventor
Richard Adney Meers
Gurney Oliver Probert
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of FR939445A publication Critical patent/FR939445A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
FR939445D 1939-03-17 1946-12-20 Telephone systems Expired FR939445A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB939445X 1939-03-17

Publications (1)

Publication Number Publication Date
FR939445A true FR939445A (en) 1948-11-15

Family

ID=10748278

Family Applications (1)

Application Number Title Priority Date Filing Date
FR939445D Expired FR939445A (en) 1939-03-17 1946-12-20 Telephone systems

Country Status (1)

Country Link
FR (1) FR939445A (en)

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