FR474853A - Improvements applicable to telephony - Google Patents

Improvements applicable to telephony

Info

Publication number
FR474853A
FR474853A FR474853A FR474853DA FR474853A FR 474853 A FR474853 A FR 474853A FR 474853 A FR474853 A FR 474853A FR 474853D A FR474853D A FR 474853DA FR 474853 A FR474853 A FR 474853A
Authority
FR
France
Prior art keywords
telephony
improvements applicable
applicable
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
FR474853A
Other languages
French (fr)
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 FR474853A publication Critical patent/FR474853A/en
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)
  • Devices For Supply Of Signal Current (AREA)
FR474853A 1913-07-09 1914-07-07 Improvements applicable to telephony Expired FR474853A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191315828T 1913-07-09

Publications (1)

Publication Number Publication Date
FR474853A true FR474853A (en) 1915-03-22

Family

ID=32371871

Family Applications (1)

Application Number Title Priority Date Filing Date
FR474853A Expired FR474853A (en) 1913-07-09 1914-07-07 Improvements applicable to telephony

Country Status (2)

Country Link
FR (1) FR474853A (en)
GB (1) GB191315828A (en)

Also Published As

Publication number Publication date
GB191315828A (en) 1914-07-09

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