FR847619A - - Google Patents
Info
- Publication number
- FR847619A FR847619A FR847619DA FR847619A FR 847619 A FR847619 A FR 847619A FR 847619D A FR847619D A FR 847619DA FR 847619 A FR847619 A FR 847619A
- Authority
- FR
- France
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/04—Switchboards
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US180075A US2173551A (en) | 1937-12-16 | 1937-12-16 | Communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR847619A true FR847619A (et) |
Family
ID=22659110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR847619D Active FR847619A (et) | 1937-12-16 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2173551A (et) |
| BE (1) | BE131631A (et) |
| DE (1) | DE742933C (et) |
| FR (1) | FR847619A (et) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2495773A (en) * | 1942-12-30 | 1950-01-31 | Bell Telephone Labor Inc | Alternating current telegraph system |
| US2605347A (en) * | 1949-04-29 | 1952-07-29 | Bell Telephone Labor Inc | Telegraph concentration board spare communication circuit |
-
0
- FR FR847619D patent/FR847619A/fr active Active
- BE BE131631D patent/BE131631A/xx unknown
-
1937
- 1937-12-16 US US180075A patent/US2173551A/en not_active Expired - Lifetime
-
1938
- 1938-12-15 DE DEI63175D patent/DE742933C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE742933C (de) | 1943-12-16 |
| BE131631A (et) | |
| US2173551A (en) | 1939-09-19 |