FR699779A - Improvements to sound reproduction equipment with amplifying devices - Google Patents

Improvements to sound reproduction equipment with amplifying devices

Info

Publication number
FR699779A
FR699779A FR699779DA FR699779A FR 699779 A FR699779 A FR 699779A FR 699779D A FR699779D A FR 699779DA FR 699779 A FR699779 A FR 699779A
Authority
FR
France
Prior art keywords
sound reproduction
amplifying devices
reproduction equipment
amplifying
equipment
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
Heinrich Johanne Kuchenmeister
Berthold Freund
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 FR699779A publication Critical patent/FR699779A/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
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR699779D 1929-10-29 1929-10-29 Improvements to sound reproduction equipment with amplifying devices Expired FR699779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR699779T 1929-10-29

Publications (1)

Publication Number Publication Date
FR699779A true FR699779A (en) 1931-02-19

Family

ID=9048397

Family Applications (1)

Application Number Title Priority Date Filing Date
FR699779D Expired FR699779A (en) 1929-10-29 1929-10-29 Improvements to sound reproduction equipment with amplifying devices

Country Status (1)

Country Link
FR (1) FR699779A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2854528A (en) * 1953-02-12 1958-09-30 Siemens Ag Combined sound film and television apparatus
US2925475A (en) * 1953-03-06 1960-02-16 Loewe Opta Ag Equipment for selectively playing records

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2854528A (en) * 1953-02-12 1958-09-30 Siemens Ag Combined sound film and television apparatus
US2925475A (en) * 1953-03-06 1960-02-16 Loewe Opta Ag Equipment for selectively playing records

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