FR547433A - Improvements to electric alarms - Google Patents

Improvements to electric alarms

Info

Publication number
FR547433A
FR547433A FR547433DA FR547433A FR 547433 A FR547433 A FR 547433A FR 547433D A FR547433D A FR 547433DA FR 547433 A FR547433 A FR 547433A
Authority
FR
France
Prior art keywords
electric alarms
alarms
electric
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.)
Sev Marchal
Original Assignee
Sev Marchal
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 Sev Marchal filed Critical Sev Marchal
Application granted granted Critical
Publication of FR547433A publication Critical patent/FR547433A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/10—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by mechanical means only

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR547433D 1922-02-18 1922-02-18 Improvements to electric alarms Expired FR547433A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR547433T 1922-02-18

Publications (1)

Publication Number Publication Date
FR547433A true FR547433A (en) 1922-12-12

Family

ID=8934211

Family Applications (1)

Application Number Title Priority Date Filing Date
FR547433D Expired FR547433A (en) 1922-02-18 1922-02-18 Improvements to electric alarms

Country Status (1)

Country Link
FR (1) FR547433A (en)

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