FR526797A - Appareil d'appel électrique - Google Patents
Appareil d'appel électriqueInfo
- Publication number
- FR526797A FR526797A FR526797A FR526797DA FR526797A FR 526797 A FR526797 A FR 526797A FR 526797 A FR526797 A FR 526797A FR 526797D A FR526797D A FR 526797DA FR 526797 A FR526797 A FR 526797A
- Authority
- FR
- France
- Prior art keywords
- call device
- electric call
- electric
- call
- 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
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C21/00—Producing acoustic time signals by electrical means
- G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
- G04C21/30—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times with provision for a number of operations at different times, e.g. ringing the bells in a school
- G04C21/32—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times with provision for a number of operations at different times, e.g. ringing the bells in a school giving indications at a number of places each at a different time, e.g. system of alarms in a hotel
- G04C21/323—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times with provision for a number of operations at different times, e.g. ringing the bells in a school giving indications at a number of places each at a different time, e.g. system of alarms in a hotel by the hand(s) or handlike members closing the contacts
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR526797T | 1920-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR526797A true FR526797A (fr) | 1921-10-13 |
Family
ID=8920976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR526797A Expired FR526797A (fr) | 1920-10-30 | 1920-10-30 | Appareil d'appel électrique |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR526797A (fr) |
-
1920
- 1920-10-30 FR FR526797A patent/FR526797A/fr not_active Expired
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