FR457870A - Perfectionnements relatifs à la téléphonie - Google Patents

Perfectionnements relatifs à la téléphonie

Info

Publication number
FR457870A
FR457870A FR457870A FR457870DA FR457870A FR 457870 A FR457870 A FR 457870A FR 457870 A FR457870 A FR 457870A FR 457870D A FR457870D A FR 457870DA FR 457870 A FR457870 A FR 457870A
Authority
FR
France
Prior art keywords
telephony
improvements relating
relating
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
FR457870A
Other languages
English (en)
Inventor
Sidney George Brown
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR457870A publication Critical patent/FR457870A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F13/00—Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
FR457870A 1912-04-18 1913-04-11 Perfectionnements relatifs à la téléphonie Expired FR457870A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191209179T 1912-04-18

Publications (1)

Publication Number Publication Date
FR457870A true FR457870A (fr) 1913-09-27

Family

ID=32571836

Family Applications (1)

Application Number Title Priority Date Filing Date
FR457870A Expired FR457870A (fr) 1912-04-18 1913-04-11 Perfectionnements relatifs à la téléphonie

Country Status (2)

Country Link
FR (1) FR457870A (fr)
GB (1) GB191209179A (fr)

Also Published As

Publication number Publication date
GB191209179A (en) 1913-04-17

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