BE454663A - - Google Patents
Info
- Publication number
- BE454663A BE454663A BE454663DA BE454663A BE 454663 A BE454663 A BE 454663A BE 454663D A BE454663D A BE 454663DA BE 454663 A BE454663 A BE 454663A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/24—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission with indicator element moving about a pivot, e.g. hinged flap or rotating vane
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH903531X | 1943-02-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE454663A true BE454663A (en:Method) |
Family
ID=4546733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE454663D BE454663A (en:Method) | 1943-02-26 |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE454663A (en:Method) |
| CH (1) | CH233690A (en:Method) |
| FR (1) | FR903531A (en:Method) |
-
0
- BE BE454663D patent/BE454663A/xx unknown
-
1943
- 1943-02-26 CH CH233690D patent/CH233690A/de unknown
-
1944
- 1944-03-22 FR FR903531D patent/FR903531A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR903531A (fr) | 1945-10-08 |
| CH233690A (de) | 1944-08-15 |