FR22613E - Electrical communications system between stations - Google Patents
Electrical communications system between stationsInfo
- Publication number
- FR22613E FR22613E FR22613A FR22613DA FR22613E FR 22613 E FR22613 E FR 22613E FR 22613 A FR22613 A FR 22613A FR 22613D A FR22613D A FR 22613DA FR 22613 E FR22613 E FR 22613E
- Authority
- FR
- France
- Prior art keywords
- stations
- communications system
- electrical communications
- electrical
- communications
- Prior art date
- 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
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US246910A US1353031A (en) | 1918-07-26 | 1918-07-26 | Vacuum-bulb for signaling apparatus |
US254974A US1371298A (en) | 1918-07-26 | 1918-09-20 | Telephone and call signal system |
Publications (1)
Publication Number | Publication Date |
---|---|
FR22613E true FR22613E (en) | 1921-08-04 |
Family
ID=26938320
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR519492A Expired FR519492A (en) | 1918-07-26 | 1918-12-31 | Electrical communications system between stations |
FR22613A Expired FR22613E (en) | 1918-07-26 | 1919-10-14 | Electrical communications system between stations |
FR22688A Expired FR22688E (en) | 1918-07-26 | 1920-01-08 | Electrical communications system between stations |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR519492A Expired FR519492A (en) | 1918-07-26 | 1918-12-31 | Electrical communications system between stations |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR22688A Expired FR22688E (en) | 1918-07-26 | 1920-01-08 | Electrical communications system between stations |
Country Status (4)
Country | Link |
---|---|
US (1) | US1371298A (en) |
FR (3) | FR519492A (en) |
GB (1) | GB144293A (en) |
NL (1) | NL8176C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2966556A (en) * | 1959-05-18 | 1960-12-27 | Bell Telephone Labor Inc | Dial tone gating circuit |
-
1918
- 1918-09-20 US US254974A patent/US1371298A/en not_active Expired - Lifetime
- 1918-12-31 FR FR519492A patent/FR519492A/en not_active Expired
-
1919
- 1919-08-09 NL NL12686A patent/NL8176C/xx active
- 1919-10-14 FR FR22613A patent/FR22613E/en not_active Expired
-
1920
- 1920-01-08 FR FR22688A patent/FR22688E/en not_active Expired
- 1920-06-02 GB GB14995/20A patent/GB144293A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR519492A (en) | 1921-06-10 |
NL8176C (en) | 1923-01-15 |
FR22688E (en) | 1921-08-04 |
US1371298A (en) | 1921-03-15 |
GB144293A (en) | 1920-10-28 |
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