GB296070A - Improvements in or relating to telephone systems - Google Patents
Improvements in or relating to telephone systemsInfo
- Publication number
- GB296070A GB296070A GB24447/28A GB2444728A GB296070A GB 296070 A GB296070 A GB 296070A GB 24447/28 A GB24447/28 A GB 24447/28A GB 2444728 A GB2444728 A GB 2444728A GB 296070 A GB296070 A GB 296070A
- Authority
- GB
- United Kingdom
- Prior art keywords
- junction
- relay
- busying
- wire
- busy
- 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
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
- F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
- F02M2700/1305—Auxiliary air supply devices for carburettors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Exchange Systems With Centralized Control (AREA)
Abstract
296,070. Associated Telephone & Telegraph Co., (Assignees of Stehlik, R. F.). March 14, 1927, [Convention date]. Divided on 287,079. Drawings to Specification. Semi-automatic exchange systems.-One wire of an automatic-manual junction is connected to battery at the outgoing end through a relay which marks the junction busy when ground is connected to the wire at the incoming end. The relay is disconnected from the junction and energized locally when the junction is taken into use. The ground connection is effected in some cases through a winding of the line relay which is unable to pull up in series with the busying relay. The line relay is initially operated over the other wire and subsequently held over both. The busying relay is operated when a fuse blows, when all the call-indicator registers but one available to the junction are busy, when the hunting switch that associates the junction with a register is in motion, when a busying key is thrown by the operator or when the relay group in which the junction terminates is being tested. The system described is identical with that described in Specification 287,079.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US296069XA | 1927-03-14 | 1927-03-14 | |
US296070XA | 1927-03-14 | 1927-03-14 | |
US175187A US1775834A (en) | 1927-03-14 | 1927-03-14 | Multioffice telephone system |
US329490A US1815169A (en) | 1927-03-14 | 1928-12-31 | Multioffice telephone system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB296070A true GB296070A (en) | 1929-04-12 |
Family
ID=27487764
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB24447/28A Expired GB296070A (en) | 1927-03-14 | 1928-01-12 | Improvements in or relating to telephone systems |
GB1107/28A Expired GB287079A (en) | 1927-03-14 | 1928-01-12 | Improvements in or relating to telephone systems |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1107/28A Expired GB287079A (en) | 1927-03-14 | 1928-01-12 | Improvements in or relating to telephone systems |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB296070A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4665068A (en) * | 1984-11-17 | 1987-05-12 | Tanabe Seiyaku Co., Ltd. | Novel 9-chloro-1,5-benzothiazepine derivatives and their pharmaceutical use |
-
1928
- 1928-01-12 GB GB24447/28A patent/GB296070A/en not_active Expired
- 1928-01-12 GB GB1107/28A patent/GB287079A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4665068A (en) * | 1984-11-17 | 1987-05-12 | Tanabe Seiyaku Co., Ltd. | Novel 9-chloro-1,5-benzothiazepine derivatives and their pharmaceutical use |
Also Published As
Publication number | Publication date |
---|---|
GB287079A (en) | 1929-02-07 |
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