BE378411A - - Google Patents
Info
- Publication number
- BE378411A BE378411A BE378411DA BE378411A BE 378411 A BE378411 A BE 378411A BE 378411D A BE378411D A BE 378411DA BE 378411 A BE378411 A BE 378411A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
- H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
- H04M17/023—Circuit arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Prepayment Telephone Systems (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE355182X | 1930-03-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE378411A true BE378411A (en) |
Family
ID=20308759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE378411D BE378411A (en) | 1930-03-21 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1855074A (en) |
| BE (1) | BE378411A (en) |
| DE (1) | DE552018C (en) |
| FR (1) | FR713495A (en) |
| GB (1) | GB355182A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB529650A (en) * | 1939-05-24 | 1940-11-26 | Standard Telephones Cables Ltd | Improvements in or relating to electric signalling systems |
| US2519867A (en) * | 1947-05-22 | 1950-08-22 | Automatic Elect Lab | Restricted service telephone system |
| US3474193A (en) * | 1967-02-01 | 1969-10-21 | Northern Electric Co | Postpay telephone paystation circuit |
-
0
- BE BE378411D patent/BE378411A/xx unknown
-
1931
- 1931-03-13 US US522403A patent/US1855074A/en not_active Expired - Lifetime
- 1931-03-18 DE DET38557D patent/DE552018C/en not_active Expired
- 1931-03-18 FR FR713495D patent/FR713495A/en not_active Expired
- 1931-03-19 GB GB8513/31A patent/GB355182A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB355182A (en) | 1931-08-20 |
| DE552018C (en) | 1932-06-08 |
| US1855074A (en) | 1932-04-19 |
| FR713495A (en) | 1931-10-28 |