BE663704A - - Google Patents
Info
- Publication number
- BE663704A BE663704A BE663704A BE663704A BE663704A BE 663704 A BE663704 A BE 663704A BE 663704 A BE663704 A BE 663704A BE 663704 A BE663704 A BE 663704A BE 663704 A BE663704 A BE 663704A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M5/00—Manual exchanges
- H04M5/12—Calling substations, e.g. by ringing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR977577A FR1406586A (en) | 1964-06-09 | 1964-06-09 | Intrinsically safe telephone device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE663704A true BE663704A (en) | 1965-09-01 |
Family
ID=8831945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE663704A BE663704A (en) | 1964-06-09 | 1965-05-10 |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE663704A (en) |
| DE (1) | DE1462204B2 (en) |
| FR (1) | FR1406586A (en) |
| GB (1) | GB1041329A (en) |
| NL (1) | NL6507181A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4064366A (en) * | 1976-01-15 | 1977-12-20 | Winster Engineering Group Limited | Intrinsically safe telephone systems |
| FR2391609A1 (en) * | 1977-05-18 | 1978-12-15 | Silec Division Signalisat Indl | INTRINSIC SECURITY TELEPHONE NETWORK |
| DE3324690C1 (en) * | 1983-07-08 | 1984-10-11 | Geobra Brandstätter GmbH & Co KG, 8502 Zirndorf | Telephone system, particularly as a children's toy |
| DE3341251A1 (en) * | 1983-11-15 | 1985-05-30 | Geobra Brandstätter GmbH & Co KG, 8502 Zirndorf | TELEPHONE SYSTEM |
-
1964
- 1964-06-09 FR FR977577A patent/FR1406586A/en not_active Expired
-
1965
- 1965-05-10 BE BE663704A patent/BE663704A/xx unknown
- 1965-05-21 GB GB2170665A patent/GB1041329A/en not_active Expired
- 1965-06-04 NL NL6507181A patent/NL6507181A/xx unknown
- 1965-06-05 DE DE19651462204 patent/DE1462204B2/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| NL6507181A (en) | 1965-12-10 |
| DE1462204B2 (en) | 1971-02-11 |
| DE1462204A1 (en) | 1968-11-21 |
| GB1041329A (en) | 1966-09-07 |
| FR1406586A (en) | 1965-07-23 |