NL57724C - - Google Patents
Info
- Publication number
- NL57724C NL57724C NL57724DA NL57724C NL 57724 C NL57724 C NL 57724C NL 57724D A NL57724D A NL 57724DA NL 57724 C NL57724 C NL 57724C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US286220A US2295032A (en) | 1939-07-24 | 1939-07-24 | Communication exchange system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL57724C true NL57724C (https=) |
Family
ID=23097618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL57724D NL57724C (https=) | 1939-07-24 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2295032A (https=) |
| CH (1) | CH235878A (https=) |
| FR (1) | FR867450A (https=) |
| GB (1) | GB541768A (https=) |
| NL (1) | NL57724C (https=) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2471415A (en) * | 1940-05-22 | 1949-05-31 | Int Standard Electric Corp | Telephone calling line identification system |
| FR960696A (https=) * | 1942-06-15 | 1950-04-22 | ||
| NL76006C (https=) * | 1946-06-20 | |||
| NL138284B (https=) * | 1948-01-08 | |||
| FR993449A (fr) * | 1949-06-27 | 1951-10-31 | Materiel Telephonique | Perfectionnements aux systèmes de commutation automatique |
| FR1034629A (fr) * | 1950-11-09 | 1953-07-28 | Materiel Telephonique | Perfectionnements aux systèmes de signalisation utilisés pour caractériser les lignes d'abonnés à un réseau téléphonique |
| BE508995A (https=) * | 1951-03-16 |
-
0
- NL NL57724D patent/NL57724C/xx active
-
1939
- 1939-07-24 US US286220A patent/US2295032A/en not_active Expired - Lifetime
-
1940
- 1940-06-18 GB GB10549/40A patent/GB541768A/en not_active Expired
- 1940-06-26 CH CH235878D patent/CH235878A/de unknown
- 1940-10-10 FR FR867450D patent/FR867450A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2295032A (en) | 1942-09-08 |
| FR867450A (fr) | 1941-10-27 |
| GB541768A (en) | 1941-12-10 |
| CH235878A (de) | 1944-12-31 |