FR728168A - Telephone amplifier - Google Patents

Telephone amplifier

Info

Publication number
FR728168A
FR728168A FR728168DA FR728168A FR 728168 A FR728168 A FR 728168A FR 728168D A FR728168D A FR 728168DA FR 728168 A FR728168 A FR 728168A
Authority
FR
France
Prior art keywords
telephone amplifier
telephone
amplifier
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
Paul Brosse
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 FR728168A publication Critical patent/FR728168A/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)
FR728168D 1931-12-12 1931-12-12 Telephone amplifier Expired FR728168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR728168T 1931-12-12

Publications (1)

Publication Number Publication Date
FR728168A true FR728168A (en) 1932-06-30

Family

ID=9111689

Family Applications (1)

Application Number Title Priority Date Filing Date
FR728168D Expired FR728168A (en) 1931-12-12 1931-12-12 Telephone amplifier

Country Status (1)

Country Link
FR (1) FR728168A (en)

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