FR829576A - Amplifier devices, in particular for telephone sets - Google Patents

Amplifier devices, in particular for telephone sets

Info

Publication number
FR829576A
FR829576A FR829576DA FR829576A FR 829576 A FR829576 A FR 829576A FR 829576D A FR829576D A FR 829576DA FR 829576 A FR829576 A FR 829576A
Authority
FR
France
Prior art keywords
telephone sets
amplifier devices
amplifier
devices
telephone
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)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR829576A publication Critical patent/FR829576A/en
Expired legal-status Critical Current

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
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
FR829576D 1936-11-20 1937-11-19 Amplifier devices, in particular for telephone sets Expired FR829576A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE228093X 1936-11-20

Publications (1)

Publication Number Publication Date
FR829576A true FR829576A (en) 1938-06-30

Family

ID=3866209

Family Applications (1)

Application Number Title Priority Date Filing Date
FR829576D Expired FR829576A (en) 1936-11-20 1937-11-19 Amplifier devices, in particular for telephone sets

Country Status (5)

Country Link
BE (1) BE418493A (en)
CH (1) CH228093A (en)
FR (1) FR829576A (en)
GB (1) GB493668A (en)
NL (1) NL49768C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965133C (en) * 1953-10-11 1957-06-06 Telefonbau & Normalzeit Gmbh Circuit arrangement for preferred call stations in telephone systems with dialer operation
DE1141681B (en) * 1961-04-07 1962-12-27 Huettenwerk Oberhausen Ag Telephone subscriber circuit for line dialing systems with speakerphone

Also Published As

Publication number Publication date
BE418493A (en)
CH228093A (en) 1943-07-31
NL49768C (en)
GB493668A (en) 1938-10-12

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