BE558459A - - Google Patents

Info

Publication number
BE558459A
BE558459A BE558459DA BE558459A BE 558459 A BE558459 A BE 558459A BE 558459D A BE558459D A BE 558459DA BE 558459 A BE558459 A BE 558459A
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 BE558459A publication Critical patent/BE558459A/xx

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/60Substation equipment, e.g. for use by subscribers including speech amplifiers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M19/00Current supply arrangements for telephone systems
    • H04M19/02Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Amplifiers (AREA)
BE558459D 1956-06-19 BE558459A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH3068325X 1956-06-19

Publications (1)

Publication Number Publication Date
BE558459A true BE558459A (de)

Family

ID=4573865

Family Applications (1)

Application Number Title Priority Date Filing Date
BE558459D BE558459A (de) 1956-06-19

Country Status (5)

Country Link
US (1) US3068325A (de)
BE (1) BE558459A (de)
CH (1) CH342993A (de)
DE (1) DE1029040B (de)
FR (1) FR1176067A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3775562A (en) * 1971-05-04 1973-11-27 Data Transmission Sciences Inc Security phone
US3908094A (en) * 1971-12-15 1975-09-23 Central Telephone S A Telephone transceiver with amplified microphone and speaker

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2277623A (en) * 1939-10-12 1942-03-24 Bell Telephone Labor Inc Telephone system
BE483203A (de) * 1947-06-14
GB743024A (en) * 1953-07-01 1956-01-04 Gen Electric Co Ltd Improvements in or relating to telephone apparatus
US2858371A (en) * 1953-07-01 1958-10-28 Gen Electric Co Ltd Telephone subscribers' apparatus
BE563970A (de) * 1957-01-15

Also Published As

Publication number Publication date
DE1029040B (de) 1958-04-30
FR1176067A (fr) 1959-04-03
US3068325A (en) 1962-12-11
CH342993A (de) 1959-12-15

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