BE378410A - - Google Patents
Info
- Publication number
- BE378410A BE378410A BE378410DA BE378410A BE 378410 A BE378410 A BE 378410A BE 378410D A BE378410D A BE 378410DA BE 378410 A BE378410 A BE 378410A
- 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE355181X | 1930-03-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE378410A true BE378410A (zh) |
Family
ID=20308758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE378410D BE378410A (zh) | 1930-03-21 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US1855087A (zh) |
| BE (1) | BE378410A (zh) |
| DE (1) | DE583068C (zh) |
| FR (1) | FR713494A (zh) |
| GB (1) | GB355181A (zh) |
| NL (1) | NL34614C (zh) |
-
0
- BE BE378410D patent/BE378410A/xx unknown
- NL NL34614D patent/NL34614C/xx active
-
1931
- 1931-03-13 US US522461A patent/US1855087A/en not_active Expired - Lifetime
- 1931-03-18 FR FR713494D patent/FR713494A/fr not_active Expired
- 1931-03-19 DE DET38565D patent/DE583068C/de not_active Expired
- 1931-03-19 GB GB8512/31A patent/GB355181A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1855087A (en) | 1932-04-19 |
| NL34614C (zh) | |
| GB355181A (en) | 1931-08-20 |
| FR713494A (fr) | 1931-10-28 |
| DE583068C (de) | 1933-08-28 |