FR765359A - Processes and apparatus for acoustic signaling and their various applications - Google Patents

Processes and apparatus for acoustic signaling and their various applications

Info

Publication number
FR765359A
FR765359A FR765359DA FR765359A FR 765359 A FR765359 A FR 765359A FR 765359D A FR765359D A FR 765359DA FR 765359 A FR765359 A FR 765359A
Authority
FR
France
Prior art keywords
processes
various applications
acoustic signaling
signaling
acoustic
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
Paul Henri Francois
Henri Adam
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 filed Critical
Application granted granted Critical
Publication of FR765359A publication Critical patent/FR765359A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B1/00—Systems for signalling characterised solely by the form of transmission of the signal
    • G08B1/08—Systems for signalling characterised solely by the form of transmission of the signal using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR765359D 1933-12-11 1933-12-11 Processes and apparatus for acoustic signaling and their various applications Expired FR765359A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR765359T 1933-12-11

Publications (1)

Publication Number Publication Date
FR765359A true FR765359A (en) 1934-06-08

Family

ID=9182713

Family Applications (1)

Application Number Title Priority Date Filing Date
FR765359D Expired FR765359A (en) 1933-12-11 1933-12-11 Processes and apparatus for acoustic signaling and their various applications

Country Status (1)

Country Link
FR (1) FR765359A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE921618C (en) * 1951-01-11 1954-12-23 Physikalisch Tech Werkstaetten Overhaul signal receiving system
DE950441C (en) * 1953-03-04 1956-10-11 Dowidat Werke Willi Dowidat Device for the transmission of acoustic signals for vehicles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE921618C (en) * 1951-01-11 1954-12-23 Physikalisch Tech Werkstaetten Overhaul signal receiving system
DE950441C (en) * 1953-03-04 1956-10-11 Dowidat Werke Willi Dowidat Device for the transmission of acoustic signals for vehicles

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