FR444499A - Spy telephonographer - Google Patents

Spy telephonographer

Info

Publication number
FR444499A
FR444499A FR444499DA FR444499A FR 444499 A FR444499 A FR 444499A FR 444499D A FR444499D A FR 444499DA FR 444499 A FR444499 A FR 444499A
Authority
FR
France
Prior art keywords
telephonographer
spy
spy telephonographer
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)
Inventor
Emile Chabeault
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 FR444499A publication Critical patent/FR444499A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1672—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using sonic detecting means, e.g. a microphone operating in the audio frequency range

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR444499D 1911-08-08 1911-08-08 Spy telephonographer Expired FR444499A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR444499T 1911-08-08

Publications (1)

Publication Number Publication Date
FR444499A true FR444499A (en) 1912-10-18

Family

ID=1485469

Family Applications (1)

Application Number Title Priority Date Filing Date
FR444499D Expired FR444499A (en) 1911-08-08 1911-08-08 Spy telephonographer

Country Status (1)

Country Link
FR (1) FR444499A (en)

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