FR547187A - Improvements to warning devices - Google Patents
Improvements to warning devicesInfo
- Publication number
- FR547187A FR547187A FR547187DA FR547187A FR 547187 A FR547187 A FR 547187A FR 547187D A FR547187D A FR 547187DA FR 547187 A FR547187 A FR 547187A
- 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
- G10K9/10—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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB547187X | 1921-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR547187A true FR547187A (en) | 1922-12-02 |
Family
ID=10471870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR547187D Expired FR547187A (en) | 1921-04-28 | 1922-02-14 | Improvements to warning devices |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR547187A (en) |
-
1922
- 1922-02-14 FR FR547187D patent/FR547187A/en not_active Expired
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