FR485439A - Improvements to alarms - Google Patents

Improvements to alarms

Info

Publication number: FR485439A
Authority: FR; France
Prior art keywords: alarms
Prior art date: 1917-05-11
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

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.)

1917-05-11

Filing date

1917-05-11

Publication date

1918-01-09

1917-05-11 Application filed by Sparks Withington Co filed Critical Sparks Withington Co

1918-01-09 Application granted granted Critical

1918-01-09 Publication of FR485439A publication Critical patent/FR485439A/en

Status Expired legal-status Critical Current

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)

1917
- 1917-05-11 FR FR485439D patent/FR485439A/en not_active Expired

Similar Documents

Publication	Publication Date	Title
FR486902A (en)	1918-05-16	Improvements to crutches
FR485846A (en)	1918-02-08	Improvements to crutches
FR517635A (en)	1921-05-09	Improvements to projectors
FR485439A (en)	1918-01-09	Improvements to alarms
FR495501A (en)	1919-10-10	Improvements to projectiles
FR488024A (en)	1918-08-13	Improvements to ships
FR490483A (en)	1919-04-24	Improvements to accumulators
FR485492A (en)	1918-01-15	Improvements to locknuts
FR485698A (en)	1918-01-29	Improvements to sutters
FR22317E (en)	1921-06-30	Improvements to hydroaeroplanes
FR24053E (en)	1922-02-21	Improvements to hydroaeroplanes
FR490996A (en)	1919-05-17	Improvements to plansichters
FR491512A (en)	1919-06-06	Improvements to ships
FR510216A (en)	1920-11-29	Improvements to phonographs
FR490777A (en)	1919-05-08	Improvements to clasps
FR486779A (en)	1918-05-08	Improvements to belts
FR489874A (en)	1919-03-19	Improvements to electric sirens
FR485783A (en)	1918-02-06	Improvements made to demountable constructions
FR488490A (en)	1918-10-15	Improvements to portholes
FR489088A (en)	1918-12-13	Improvements to pumps
FR22286E (en)	1921-05-25	Improvements to airplanes
FR490350A (en)	1919-04-17	Improvements to gasifiers
FR491791A (en)	1919-06-17	Improvements to mechanical tractors
FR484931A (en)	1917-11-22	Improvements to brackets
FR490249A (en)	1919-04-09	Improvements to hydrometers