FR403209A - Perfectionnements relatifs à la téléphonie ou la télégraphie - Google Patents

Perfectionnements relatifs à la téléphonie ou la télégraphie

Info

Publication number
FR403209A
FR403209A FR403209DA FR403209A FR 403209 A FR403209 A FR 403209A FR 403209D A FR403209D A FR 403209DA FR 403209 A FR403209 A FR 403209A
Authority
FR
France
Prior art keywords
telegraphy
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
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 FR403209A publication Critical patent/FR403209A/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)
FR403209D 1908-05-22 1909-05-21 Perfectionnements relatifs à la téléphonie ou la télégraphie Expired FR403209A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB403209X 1908-05-22

Publications (1)

Publication Number Publication Date
FR403209A true FR403209A (fr) 1909-10-28

Family

ID=1447873

Family Applications (1)

Application Number Title Priority Date Filing Date
FR403209D Expired FR403209A (fr) 1908-05-22 1909-05-21 Perfectionnements relatifs à la téléphonie ou la télégraphie

Country Status (1)

Country Link
FR (1) FR403209A (fr)

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