GB299814A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB299814A
GB299814A GB31858/28A GB3185828A GB299814A GB 299814 A GB299814 A GB 299814A GB 31858/28 A GB31858/28 A GB 31858/28A GB 3185828 A GB3185828 A GB 3185828A GB 299814 A GB299814 A GB 299814A
Authority
GB
United Kingdom
Prior art keywords
test
vertical
over
bank
ground
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
GB31858/28A
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph 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 Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Publication of GB299814A publication Critical patent/GB299814A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (AREA)
  • Relay Circuits (AREA)

Abstract

299,814. Associated Telephone & Telegraph Co., (Assignees of Stehlik, R. F.). May 25, 1927, [Convention date]. Divided on 291,045. Drawings to Specification. Automatic exchange systems.-In a bi-directional call-finder hunting in both directions of motion, two test-wipers for controlling the motions are permanently connected together and a calling line is marked by ground in the vertical test-bank and absence of ground in the rotary test-bank. The vertical motion is terminaed by energisation of the change-over relay over the. vertical test-wiper, the stepping relay being temporarily held in series therewith so that the first impulse is sent immediately to the rotary magnet. The vertical test-contacts are normally connected to battery over resistances. A callfinder of a, group is preselected by one or other of two similar allotting switches used alternately for simultaneous calls. The circuits of the release magnets of the finders include a common metering device so that the number of operations of the finders is recorded. The system described is identical with that described in Specification 291,045, which claims other features.
GB31858/28A 1927-05-25 1928-01-09 Improvements in or relating to telephone systems Expired GB299814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US193960A US1677414A (en) 1927-05-25 1927-05-25 Automatic telephone system

Publications (1)

Publication Number Publication Date
GB299814A true GB299814A (en) 1929-04-09

Family

ID=22715742

Family Applications (2)

Application Number Title Priority Date Filing Date
GB31858/28A Expired GB299814A (en) 1927-05-25 1928-01-09 Improvements in or relating to telephone systems
GB752/28A Expired GB291045A (en) 1927-05-25 1928-01-09 Improvements in or relating to telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB752/28A Expired GB291045A (en) 1927-05-25 1928-01-09 Improvements in or relating to telephone systems

Country Status (2)

Country Link
US (1) US1677414A (en)
GB (2) GB299814A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE519943A (en) * 1952-02-13

Also Published As

Publication number Publication date
GB291045A (en) 1929-04-09
US1677414A (en) 1928-07-17

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