BE571915A - - Google Patents

Info

Publication number
BE571915A
BE571915A BE571915DA BE571915A BE 571915 A BE571915 A BE 571915A BE 571915D A BE571915D A BE 571915DA BE 571915 A BE571915 A BE 571915A
Authority
BE
Belgium
Application number
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.)
Publication of BE571915A publication Critical patent/BE571915A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
BE571915D 1957-10-10 BE571915A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE920657 1957-10-10

Publications (1)

Publication Number Publication Date
BE571915A true BE571915A (fr)

Family

ID=20276115

Family Applications (1)

Application Number Title Priority Date Filing Date
BE571915D BE571915A (fr) 1957-10-10

Country Status (4)

Country Link
US (1) US3055986A (fr)
BE (1) BE571915A (fr)
CH (1) CH372351A (fr)
GB (1) GB890860A (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1092065B (de) * 1958-10-13 1960-11-03 Hermann Wetzer K G Vorrichtung zur magnetischen Aufnahme und Wiedergabe von Waehlimpulsen
JPS5340824A (en) * 1976-09-27 1978-04-13 Hitachi Ltd Combining circuit
FR2653123B1 (fr) * 1989-10-17 1992-01-17 Roussel Uclaf Nouveaux derives de la pyridone, leur procede de preparation, les nouveaux intermediaires obtenus, leur application a titre de medicaments et les compositions pharmaceutiques les renfermant.
GB2324006B (en) * 1997-04-02 2001-08-22 David Williams Electronic modulation scheme

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2232398A (en) * 1939-11-28 1941-02-18 Bell Telephone Labor Inc Telephone substation circuit
US2554201A (en) * 1946-06-19 1951-05-22 Ericsson Telefon Ab L M Key-sending automatic telephone signaling system
US2717280A (en) * 1954-03-01 1955-09-06 Bell Telephone Labor Inc Signaling or dialing system
US2875281A (en) * 1954-03-08 1959-02-24 Bell Telephone Labor Inc Telephone ringing system

Also Published As

Publication number Publication date
CH372351A (de) 1963-10-15
US3055986A (en) 1962-09-25
GB890860A (en) 1962-03-07

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