NL48597C - - Google Patents
Info
- Publication number
- NL48597C NL48597C NL48597DA NL48597C NL 48597 C NL48597 C NL 48597C NL 48597D A NL48597D A NL 48597DA NL 48597 C NL48597 C NL 48597C
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/677—Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Set Structure (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmission Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH500971X | 1936-08-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL48597C true NL48597C (zh) |
Family
ID=4516927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL48597D NL48597C (zh) | 1936-08-19 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US2216850A (zh) |
| BE (1) | BE423200A (zh) |
| CH (1) | CH195491A (zh) |
| DE (1) | DE690679C (zh) |
| FR (1) | FR825777A (zh) |
| GB (1) | GB500971A (zh) |
| NL (1) | NL48597C (zh) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3284578A (en) * | 1963-02-11 | 1966-11-08 | Earl R Evans | Direct-dialing long-distance telephone systems |
| US3358087A (en) * | 1964-05-21 | 1967-12-12 | Western Electric Co | Telephone instrument dialing control device |
-
0
- BE BE423200D patent/BE423200A/xx unknown
- NL NL48597D patent/NL48597C/xx active
-
1936
- 1936-08-19 CH CH195491D patent/CH195491A/fr unknown
-
1937
- 1937-08-18 US US159790A patent/US2216850A/en not_active Expired - Lifetime
- 1937-08-19 FR FR825777D patent/FR825777A/fr not_active Expired
- 1937-08-19 GB GB22774/37A patent/GB500971A/en not_active Expired
- 1937-08-20 DE DE1937M0138992 patent/DE690679C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE423200A (zh) | |
| CH195491A (fr) | 1938-01-31 |
| DE690679C (de) | 1940-05-04 |
| US2216850A (en) | 1940-10-08 |
| FR825777A (fr) | 1938-03-14 |
| GB500971A (en) | 1939-02-20 |