FR1604442A - - Google Patents
Info
- Publication number
- FR1604442A FR1604442A FR1604442DA FR1604442A FR 1604442 A FR1604442 A FR 1604442A FR 1604442D A FR1604442D A FR 1604442DA FR 1604442 A FR1604442 A FR 1604442A
- 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR182368 | 1968-12-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR1604442A true FR1604442A (it) | 1971-11-08 |
Family
ID=8659604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR1604442D Expired FR1604442A (it) | 1968-12-31 | 1968-12-31 |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR1604442A (it) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2361709A1 (fr) * | 1976-08-11 | 1978-03-10 | Ward Goldstone Ltd | Generateur acoustique |
-
1968
- 1968-12-31 FR FR1604442D patent/FR1604442A/fr not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2361709A1 (fr) * | 1976-08-11 | 1978-03-10 | Ward Goldstone Ltd | Generateur acoustique |