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FR657655A - Protective device for lamps used in wireless telegraphy and telephony - Google Patents

Protective device for lamps used in wireless telegraphy and telephony

Info

Publication number
FR657655A
FR657655A FR657655DA FR657655A FR 657655 A FR657655 A FR 657655A FR 657655D A FR657655D A FR 657655DA FR 657655 A FR657655 A FR 657655A
Authority
FR
France
Prior art keywords
telephony
protective device
lamps used
wireless telegraphy
telegraphy
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)
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.)
EYMAR FRERES ETS
Original Assignee
EYMAR FRERES ETS
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 EYMAR FRERES ETS filed Critical EYMAR FRERES ETS
Application granted granted Critical
Publication of FR657655A publication Critical patent/FR657655A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
    • H03F1/544—Protection of filaments

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
FR657655D 1927-11-29 1927-11-29 Protective device for lamps used in wireless telegraphy and telephony Expired FR657655A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR657655T 1927-11-29

Publications (1)

Publication Number Publication Date
FR657655A true FR657655A (en) 1929-05-25

Family

ID=9008565

Family Applications (1)

Application Number Title Priority Date Filing Date
FR657655D Expired FR657655A (en) 1927-11-29 1927-11-29 Protective device for lamps used in wireless telegraphy and telephony

Country Status (1)

Country Link
FR (1) FR657655A (en)

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