FR769145A - sound transmitter - Google Patents

sound transmitter

Info

Publication number
FR769145A
FR769145A FR769145DA FR769145A FR 769145 A FR769145 A FR 769145A FR 769145D A FR769145D A FR 769145DA FR 769145 A FR769145 A FR 769145A
Authority
FR
France
Prior art keywords
sound transmitter
transmitter
sound
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.)
MEAF Machinerieen en Apparaten Fabrieken NV
Original Assignee
MEAF Machinerieen en Apparaten Fabrieken NV
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 MEAF Machinerieen en Apparaten Fabrieken NV filed Critical MEAF Machinerieen en Apparaten Fabrieken NV
Application granted granted Critical
Publication of FR769145A publication Critical patent/FR769145A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
FR769145D 1933-06-15 1934-02-23 sound transmitter Expired FR769145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE769145X 1933-06-15

Publications (1)

Publication Number Publication Date
FR769145A true FR769145A (en) 1934-08-20

Family

ID=6673901

Family Applications (1)

Application Number Title Priority Date Filing Date
FR769145D Expired FR769145A (en) 1933-06-15 1934-02-23 sound transmitter

Country Status (1)

Country Link
FR (1) FR769145A (en)

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