FR485439A - Improvements to alarms - Google Patents

Improvements to alarms

Info

Publication number
FR485439A
FR485439A FR485439DA FR485439A FR 485439 A FR485439 A FR 485439A FR 485439D A FR485439D A FR 485439DA FR 485439 A FR485439 A FR 485439A
Authority
FR
France
Prior art keywords
alarms
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.)
Sparks Withington Co
Original Assignee
Sparks Withington Co
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 Sparks Withington Co filed Critical Sparks Withington Co
Application granted granted Critical
Publication of FR485439A publication Critical patent/FR485439A/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)
FR485439D 1917-05-11 1917-05-11 Improvements to alarms Expired FR485439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR485439T 1917-05-11

Publications (1)

Publication Number Publication Date
FR485439A true FR485439A (en) 1918-01-09

Family

ID=1522147

Family Applications (1)

Application Number Title Priority Date Filing Date
FR485439D Expired FR485439A (en) 1917-05-11 1917-05-11 Improvements to alarms

Country Status (1)

Country Link
FR (1) FR485439A (en)

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