NL34667C - - Google Patents
Info
- Publication number
- NL34667C NL34667C NL34667DA NL34667C NL 34667 C NL34667 C NL 34667C NL 34667D A NL34667D A NL 34667DA NL 34667 C NL34667 C NL 34667C
- Authority
- NL
- Netherlands
Links
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL79242D DE640588C (en) | 1931-09-01 | 1931-09-01 | Number switch for self-connecting telephones with locking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL34667C true NL34667C (en) |
Family
ID=7284584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL34667D NL34667C (en) | 1931-09-01 |
Country Status (2)
| Country | Link |
|---|---|
| DE (2) | DE640588C (en) |
| NL (1) | NL34667C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19608162A1 (en) * | 1996-03-04 | 1997-09-11 | Hoechst Ag | Ortho-substituted benzoylguanidines, process for their preparation, their use as a medicament or diagnostic agent, and medicament containing them |
-
0
- DE DENDAT623828D patent/DE623828C/de active Active
- NL NL34667D patent/NL34667C/xx active
-
1931
- 1931-09-01 DE DEL79242D patent/DE640588C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE623828C (en) | |
| DE640588C (en) | 1937-01-08 |