FR688274A - Avertisseur électro-magnétique - Google Patents
Avertisseur électro-magnétiqueInfo
- Publication number
- FR688274A FR688274A FR688274DA FR688274A FR 688274 A FR688274 A FR 688274A FR 688274D A FR688274D A FR 688274DA FR 688274 A FR688274 A FR 688274A
- Authority
- FR
- France
- Prior art keywords
- electro
- magnetic horn
- horn
- magnetic
- 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
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR688274T | 1929-04-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR688274A true FR688274A (fr) | 1930-08-21 |
Family
ID=9026638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR688274D Expired FR688274A (fr) | 1929-04-06 | 1929-04-06 | Avertisseur électro-magnétique |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR688274A (fr) |
-
1929
- 1929-04-06 FR FR688274D patent/FR688274A/fr not_active Expired
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