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FR887178A - Telephone and analog systems - Google Patents

Telephone and analog systems

Info

Publication number
FR887178A
FR887178A FR887178DA FR887178A FR 887178 A FR887178 A FR 887178A FR 887178D A FR887178D A FR 887178DA FR 887178 A FR887178 A FR 887178A
Authority
FR
France
Prior art keywords
telephone
analog systems
analog
systems
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
Other languages
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR887178A publication Critical patent/FR887178A/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)
  • Telephonic Communication Services (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
FR887178D 1941-01-24 1941-12-11 Telephone and analog systems Expired FR887178A (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
FR887178A true FR887178A (en) 1943-11-05

Family

ID=23481995

Family Applications (1)

Application Number Title Priority Date Filing Date
FR887178D Expired FR887178A (en) 1941-01-24 1941-12-11 Telephone and analog systems

Country Status (5)

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

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR856240A (en) * 1939-02-07 1940-06-07 Materiel Telephonique Signal broadcasting systems over automatic or similar telephone networks
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) * 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
NL70302C (en) 1952-02-15
US2317191A (en) 1943-04-20
DE745935C (en) 1944-12-19
GB551431A (en) 1943-02-22

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