FR28793E - Improvements to electric alarms - Google Patents

Improvements to electric alarms

Info

Publication number
FR28793E
FR28793E FR28793DA FR28793E FR 28793 E FR28793 E FR 28793E FR 28793D A FR28793D A FR 28793DA FR 28793 E FR28793 E FR 28793E
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 FR28793E publication Critical patent/FR28793E/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)
FR28793D 1924-02-28 1924-02-28 Improvements to electric alarms Expired FR28793E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR28793T 1924-02-28

Publications (1)

Publication Number Publication Date
FR28793E true FR28793E (en) 1925-03-23

Family

ID=8666908

Family Applications (1)

Application Number Title Priority Date Filing Date
FR28793D Expired FR28793E (en) 1924-02-28 1924-02-28 Improvements to electric alarms

Country Status (1)

Country Link
FR (1) FR28793E (en)

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