FR739331A - - Google Patents
Info
- Publication number
- FR739331A FR739331A FR739331DA FR739331A FR 739331 A FR739331 A FR 739331A FR 739331D A FR739331D A FR 739331DA FR 739331 A FR739331 A FR 739331A
- Authority
- FR
- France
- 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)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR739331A true FR739331A (sv) | 1933-01-06 |
Family
ID=1545418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR739331D Expired FR739331A (sv) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR739331A (sv) |
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0
- FR FR739331D patent/FR739331A/fr not_active Expired