FR772670A - Installation for receiving telephone calls via loudspeaker - Google Patents

Installation for receiving telephone calls via loudspeaker

Info

Publication number
FR772670A
FR772670A FR772670DA FR772670A FR 772670 A FR772670 A FR 772670A FR 772670D A FR772670D A FR 772670DA FR 772670 A FR772670 A FR 772670A
Authority
FR
France
Prior art keywords
installation
telephone calls
receiving telephone
calls via
via loudspeaker
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
Louis Paul Durand
Pier Carlo Ricchiardi
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 FR772670A publication Critical patent/FR772670A/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)
FR772670D 1933-08-04 1933-08-04 Installation for receiving telephone calls via loudspeaker Expired FR772670A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR772670T 1933-08-04

Publications (1)

Publication Number Publication Date
FR772670A true FR772670A (en) 1934-11-03

Family

ID=9194996

Family Applications (1)

Application Number Title Priority Date Filing Date
FR772670D Expired FR772670A (en) 1933-08-04 1933-08-04 Installation for receiving telephone calls via loudspeaker

Country Status (1)

Country Link
FR (1) FR772670A (en)

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