NL54789C - - Google Patents
Info
- Publication number
- NL54789C NL54789C NL54789DA NL54789C NL 54789 C NL54789 C NL 54789C NL 54789D A NL54789D A NL 54789DA NL 54789 C NL54789 C NL 54789C
- Authority
- NL
- Netherlands
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)
- Prepayment Telephone Systems (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE219318X | 1940-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL54789C true NL54789C (en:Method) |
Family
ID=5831805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL54789D NL54789C (en:Method) | 1940-06-28 |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH219318A (en:Method) |
| NL (1) | NL54789C (en:Method) |
-
0
- NL NL54789D patent/NL54789C/xx active
-
1941
- 1941-04-09 CH CH219318D patent/CH219318A/de unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH219318A (de) | 1942-01-31 |