BE481181A - - Google Patents

Info

Publication number
BE481181A
BE481181A BE481181DA BE481181A BE 481181 A BE481181 A BE 481181A BE 481181D A BE481181D A BE 481181DA BE 481181 A BE481181 A BE 481181A
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 BE481181A publication Critical patent/BE481181A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/62—Constructional arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
BE481181D 1947-04-29 BE481181A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2498153X 1947-04-29

Publications (1)

Publication Number Publication Date
BE481181A true BE481181A (fr)

Family

ID=9685838

Family Applications (1)

Application Number Title Priority Date Filing Date
BE481181D BE481181A (fr) 1947-04-29

Country Status (2)

Country Link
US (1) US2498153A (fr)
BE (1) BE481181A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763719A (en) * 1954-08-02 1956-09-18 Jay V Zimmerman Company Intercommunication devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US893820A (en) * 1907-03-20 1908-07-21 Electric Goods Mfg Company Intercommunicating telephones.
US2157140A (en) * 1936-09-26 1939-05-09 Louis A Molin Transmitting and amplifying system
GB508031A (en) * 1937-12-23 1939-06-23 Automatic Telephone & Elect Improvements in or relating to telephone systems

Also Published As

Publication number Publication date
US2498153A (en) 1950-02-21

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