BE440986A - - Google Patents
Info
- Publication number
- BE440986A BE440986A BE440986DA BE440986A BE 440986 A BE440986 A BE 440986A BE 440986D A BE440986D A BE 440986DA BE 440986 A BE440986 A BE 440986A
- Authority
- BE
- Belgium
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Emergency Protection Circuit Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US321365A US2285022A (en) | 1940-02-29 | 1940-02-29 | Telephone substation apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE440986A true BE440986A (en:Method) |
Family
ID=23250300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE440986D BE440986A (en:Method) | 1940-02-29 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2285022A (en:Method) |
| BE (1) | BE440986A (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3997733A (en) * | 1975-05-01 | 1976-12-14 | Browne-Davies Electronic Corporation | Intrinsically safe communication systems |
-
0
- BE BE440986D patent/BE440986A/xx unknown
-
1940
- 1940-02-29 US US321365A patent/US2285022A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2285022A (en) | 1942-06-02 |