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
Application number
GB5388/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SPX Corp
Original Assignee
General Railway Signal Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Railway Signal CofiledCriticalGeneral Railway Signal Co
Publication of GB850113ApublicationCriticalpatent/GB850113A/en
B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L21/00—Station blocking between signal boxes in one yard
B61L21/06—Vehicle-on-line indication; Monitoring locking and release of the route
Landscapes
Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
Train Traffic Observation, Control, And Security
(AREA)
Abstract
850,113. Transistor oscillator circuits. GENERAL RAILWAY SIGNAL CO. Feb. 19, 1958 [March 25, 1957], No. 5388/58. Class 40(6). [Also in Group XXXVIII] An oscillator, for use in a selective signalling system, (see Group XXXVIII), comprises a P-N-P junction transistor Fig. 3 having a resonant circuit 62, 63, 64, 65, and a potentiometer 58 to adjust the output signal obtained from a transformer T1 via series-tuned inductances 67, 68.
GB5388/58A1957-03-251958-02-19Improvements in or relating to railway communication systems
ExpiredGB850113A
(en)
Arrangement for transmitting the command "request to send" from the transmitting to the receiving station in FM or PM transmission systems on telephone connections
Circuit arrangement for the detection of the loop closure at subscriber stations with semiconductor amplifiers fed via the connection line in telecommunication systems, in particular telephone switching systems