FR717172A - Improvements to warning devices - Google Patents
Improvements to warning devicesInfo
- Publication number
- FR717172A FR717172A FR717172DA FR717172A FR 717172 A FR717172 A FR 717172A FR 717172D A FR717172D A FR 717172DA FR 717172 A FR717172 A FR 717172A
- Authority
- FR
- France
- Prior art keywords
- warning devices
- warning
- devices
- 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
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
- G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US717172XA | 1930-10-03 | 1930-10-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR717172A true FR717172A (en) | 1932-01-05 |
Family
ID=22103117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR717172D Expired FR717172A (en) | 1930-10-03 | 1931-05-16 | Improvements to warning devices |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR717172A (en) |
-
1931
- 1931-05-16 FR FR717172D patent/FR717172A/en not_active Expired
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