FR709899A - Avertisseur sonore - Google Patents

Avertisseur sonore

Info

Publication number
FR709899A
FR709899A FR709899DA FR709899A FR 709899 A FR709899 A FR 709899A FR 709899D A FR709899D A FR 709899DA FR 709899 A FR709899 A FR 709899A
Authority
FR
France
Prior art keywords
buzzer
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
English (en)
Inventor
Georges-Gaston Royer
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 FR709899A publication Critical patent/FR709899A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems, e.g. audible personal calling systems
    • G08B3/06—Audible signalling systems, e.g. audible personal calling systems using hydraulic transmission; using pneumatic transmission

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR709899D 1931-01-23 1931-01-23 Avertisseur sonore Expired FR709899A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR709899T 1931-01-23

Publications (1)

Publication Number Publication Date
FR709899A true FR709899A (fr) 1931-08-14

Family

ID=9069726

Family Applications (1)

Application Number Title Priority Date Filing Date
FR709899D Expired FR709899A (fr) 1931-01-23 1931-01-23 Avertisseur sonore

Country Status (1)

Country Link
FR (1) FR709899A (fr)

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