FR788456A - Telephone device applicable to acoustic frequency amplifiers - Google Patents

Telephone device applicable to acoustic frequency amplifiers

Info

Publication number
FR788456A
FR788456A FR788456DA FR788456A FR 788456 A FR788456 A FR 788456A FR 788456D A FR788456D A FR 788456DA FR 788456 A FR788456 A FR 788456A
Authority
FR
France
Prior art keywords
telephone device
acoustic frequency
device applicable
frequency amplifiers
amplifiers
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
Schwartzmann Henri
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 filed Critical
Application granted granted Critical
Publication of FR788456A publication Critical patent/FR788456A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
FR788456D 1936-03-23 1935-04-01 Telephone device applicable to acoustic frequency amplifiers Expired FR788456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR815434T 1936-03-23

Publications (1)

Publication Number Publication Date
FR788456A true FR788456A (en) 1935-10-10

Family

ID=9267247

Family Applications (2)

Application Number Title Priority Date Filing Date
FR788456D Expired FR788456A (en) 1936-03-23 1935-04-01 Telephone device applicable to acoustic frequency amplifiers
FR815434D Expired FR815434A (en) 1936-03-23 1936-03-23 Sound transmission installation

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR815434D Expired FR815434A (en) 1936-03-23 1936-03-23 Sound transmission installation

Country Status (3)

Country Link
BE (1) BE414653A (en)
FR (2) FR788456A (en)
GB (1) GB477967A (en)

Also Published As

Publication number Publication date
GB477967A (en) 1938-01-06
FR815434A (en) 1937-07-12
BE414653A (en)

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