FR550784A - - Google Patents
Info
- Publication number
- FR550784A FR550784A FR550784DA FR550784A FR 550784 A FR550784 A FR 550784A FR 550784D A FR550784D A FR 550784DA FR 550784 A FR550784 A FR 550784A
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
- Telephone Set Structure (AREA)
- Magnetic Treatment Devices (AREA)
- Percussion Or Vibration Massage (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US469414A US1674652A (en) | 1921-05-14 | 1921-05-14 | Automatic telephone system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR550784A true FR550784A (en) | 1923-03-20 |
Family
ID=23863694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR550784D Expired FR550784A (en) | 1921-05-14 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1674652A (en) |
| FR (1) | FR550784A (en) |
| GB (1) | GB179930A (en) |
-
0
- FR FR550784D patent/FR550784A/fr not_active Expired
-
1921
- 1921-05-14 US US469414A patent/US1674652A/en not_active Expired - Lifetime
-
1922
- 1922-05-06 GB GB12869/22A patent/GB179930A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB179930A (en) | 1923-08-07 |
| US1674652A (en) | 1928-06-26 |