GB551431A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB551431A
GB551431A GB2394/42A GB239442A GB551431A GB 551431 A GB551431 A GB 551431A GB 2394/42 A GB2394/42 A GB 2394/42A GB 239442 A GB239442 A GB 239442A GB 551431 A GB551431 A GB 551431A
Authority
GB
United Kingdom
Prior art keywords
relays
relay
channel
operated
marking
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
GB2394/42A
Other languages
English (en)
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB551431A publication Critical patent/GB551431A/en
Expired legal-status Critical Current

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
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (AREA)
GB2394/42A 1941-01-24 1942-02-24 Improvements in or relating to telephone systems Expired GB551431A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US375713A US2317191A (en) 1941-01-24 1941-01-24 Telephone system

Publications (1)

Publication Number Publication Date
GB551431A true GB551431A (en) 1943-02-22

Family

ID=23481995

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2394/42A Expired GB551431A (en) 1941-01-24 1942-02-24 Improvements in or relating to telephone systems

Country Status (5)

Country Link
US (1) US2317191A (en, 2012)
DE (1) DE745935C (en, 2012)
FR (1) FR887178A (en, 2012)
GB (1) GB551431A (en, 2012)
NL (1) NL70302C (en, 2012)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR856240A (fr) * 1939-02-07 1940-06-07 Materiel Telephonique Systèmes de diffusion de signaux sur des réseaux téléphoniques automatiques ou analogues
US2434898A (en) * 1943-01-13 1948-01-27 Bell Telephone Labor Inc Digit registering means responsive to selective frequencies
US2534822A (en) * 1944-11-17 1950-12-19 Ericsson Telefon Ab L M Connecting device for telephone exchanges using a register
US2620401A (en) * 1945-04-04 1952-12-02 Vigren Sten Daniel Automatic telephone system
US2724183A (en) * 1945-12-27 1955-11-22 Calibron Products Inc Remotely controlled precision drive and calculating systems
US2564378A (en) * 1946-05-06 1951-08-14 Punch Engineering Pty Ltd Carrier system signaling circuits
GB654639A (en) * 1947-02-07 1951-06-27 Standard Telephones Cables Ltd Improvements in or relating to electric signalling systems
US2572740A (en) * 1948-05-10 1951-10-23 Bell Telephone Labor Inc Private branch exchange telephone system
US2697749A (en) * 1951-06-20 1954-12-21 Bell Telephone Labor Inc Multifrequency telephone switching system
US2732432A (en) * 1951-07-13 1956-01-24 hullegard
BE546101A (en, 2012) * 1954-04-08

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2201296A (en) * 1938-10-18 1940-05-21 Bell Telephone Labor Inc Telephone system

Also Published As

Publication number Publication date
DE745935C (de) 1944-12-19
FR887178A (fr) 1943-11-05
NL70302C (en, 2012) 1952-02-15
US2317191A (en) 1943-04-20

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