GB735689A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB735689A
GB735689A GB901254A GB901254A GB735689A GB 735689 A GB735689 A GB 735689A GB 901254 A GB901254 A GB 901254A GB 901254 A GB901254 A GB 901254A GB 735689 A GB735689 A GB 735689A
Authority
GB
United Kingdom
Prior art keywords
tubes
conversational
relating
telephone systems
telephone
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
Application number
GB901254A
Inventor
Alan Davison
Ronald Threadgold
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB901254A priority Critical patent/GB735689A/en
Publication of GB735689A publication Critical patent/GB735689A/en
Expired legal-status Critical Current

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
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/525—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using tubes in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

735,689. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd. Nov. 10, 1952 [Dec. 14, 1951], No. 9012/54. Divided out of 735,635. Class 40 (4). In a telephone system employing a plurality of sets of gas-discharge tubes through which conversational and control paths are extended on the striking of the tubes of a set, circuit arrangements are provided for restriking said conversational tubes automatically if they are extinguished by a voltage surge. The subjectmatter of the Specification in respect of Figs. 1-7 (not shown) is identical with that of Specifications 735,635 and 735,690, but the claims differ. In Fig. 8 an alternative circuit for the speech path is shown as far as transformer TR2. In this case VT4 conducts during speech instead of extinguishing.
GB901254A 1951-12-14 1951-12-14 Improvements in or relating to telephone systems Expired GB735689A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB901254A GB735689A (en) 1951-12-14 1951-12-14 Improvements in or relating to telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB901254A GB735689A (en) 1951-12-14 1951-12-14 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB735689A true GB735689A (en) 1955-08-24

Family

ID=9863644

Family Applications (1)

Application Number Title Priority Date Filing Date
GB901254A Expired GB735689A (en) 1951-12-14 1951-12-14 Improvements in or relating to telephone systems

Country Status (1)

Country Link
GB (1) GB735689A (en)

Similar Documents

Publication Publication Date Title
GB735689A (en) Improvements in or relating to telephone systems
CH305540A (en) Arc corridor for an air rupture circuit breaker.
AU165451B2 (en) Improvements ina telephone system employing gas discharge tubes as conversational and control paths
AU1416252A (en) Improvements ina telephone system employing gas discharge tubes as conversational and control paths
AT247956B (en) Compressed gas supply system with closed gas circuit for circuit breakers, disconnectors, etc.
AU166081B2 (en) Improvements in telephone systems having control paths completed on the striking of gas discharge tubes
CA486752A (en) Gas discharge tubes and circuit arrangements therefor
GB735690A (en) Improvements in or relating to telephone systems
ES31120U (en) Intercom with signaling device (Machine-translation by Google Translate, not legally binding)
CA398807A (en) Gas blast circuit breaker
CA516175A (en) Telephone selecting systems employing combined selecting and talking path gas-discharge tube and selective disconnection
CA492088A (en) Arrangement for igniting two or more gasor vapour-filled main discharge tubes
GB667764A (en) Means for operating gas-discharge lamps from a low-voltage source of direct current
FR2341240A1 (en) Telephone listen in equipment - has bridge connections and switches allowing combinations of listen and speak
CA481294A (en) Gaseous discharge device circuits, auxiliary fixtures and operation
CA543452A (en) Circuit breaker control system
CA485758A (en) Arc extinguishing circuit interrupter
DK79203C (en) Apparatus for limiting the primary current when switching on transformers.
ES222573A1 (en) New indicator-monophase switch for maximum consumption (Machine-translation by Google Translate, not legally binding)
GB763130A (en) Improvements in or relating to cinematograph projection and sound reproduction installations
AU203848B2 (en) Communication circuit employing gas tubes
AU116228B2 (en) Telephone call indicator systems employing gas discharge tubes
CA523561A (en) Telegraph service board circuits
CA478898A (en) Circuit breaker control systems
GB568912A (en) Sound operated electric gear