FR460656A - Automatic switch for telephone currents - Google Patents

Automatic switch for telephone currents

Info

Publication number
FR460656A
FR460656A FR460656A FR460656DA FR460656A FR 460656 A FR460656 A FR 460656A FR 460656 A FR460656 A FR 460656A FR 460656D A FR460656D A FR 460656DA FR 460656 A FR460656 A FR 460656A
Authority
FR
France
Prior art keywords
automatic switch
telephone currents
currents
telephone
automatic
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
FR460656A
Other languages
French (fr)
Inventor
Knut Erick Ericsson
Gustaf Wilhelm Dahlstroem
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 FR460656A publication Critical patent/FR460656A/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
FR460656A 1912-07-26 1913-07-22 Automatic switch for telephone currents Expired FR460656A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE460656X 1912-07-26

Publications (1)

Publication Number Publication Date
FR460656A true FR460656A (en) 1913-12-09

Family

ID=8901681

Family Applications (1)

Application Number Title Priority Date Filing Date
FR460656A Expired FR460656A (en) 1912-07-26 1913-07-22 Automatic switch for telephone currents

Country Status (2)

Country Link
DE (1) DE293234C (en)
FR (1) FR460656A (en)

Also Published As

Publication number Publication date
DE293234C (en)

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