GB566779A - Improvements in electrical signalling systems - Google Patents

Improvements in electrical signalling systems

Info

Publication number
GB566779A
GB566779A GB11075/43A GB1107543A GB566779A GB 566779 A GB566779 A GB 566779A GB 11075/43 A GB11075/43 A GB 11075/43A GB 1107543 A GB1107543 A GB 1107543A GB 566779 A GB566779 A GB 566779A
Authority
GB
United Kingdom
Prior art keywords
switch
key
line
contacts
tone
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
GB11075/43A
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.)
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
Priority to NL63260D priority Critical patent/NL63260C/xx
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB11075/43A priority patent/GB566779A/en
Priority to US537564A priority patent/US2421169A/en
Priority to ES0166712A priority patent/ES166712A1/es
Publication of GB566779A publication Critical patent/GB566779A/en
Priority to FR932188D priority patent/FR932188A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/12—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in shaft furnaces

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
GB11075/43A 1943-07-08 1943-07-08 Improvements in electrical signalling systems Expired GB566779A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL63260D NL63260C (enrdf_load_stackoverflow) 1943-07-08
GB11075/43A GB566779A (en) 1943-07-08 1943-07-08 Improvements in electrical signalling systems
US537564A US2421169A (en) 1943-07-08 1944-05-27 Automatic telephone system directed with the aid of revertive audio-frequency signals
ES0166712A ES166712A1 (es) 1943-07-08 1944-06-30 UN SISTEMA DE SENALES TELEFoNICO O SIMILAR
FR932188D FR932188A (fr) 1943-07-08 1946-08-12 Perfectionnements aux dispositifs électriques de transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11075/43A GB566779A (en) 1943-07-08 1943-07-08 Improvements in electrical signalling systems

Publications (1)

Publication Number Publication Date
GB566779A true GB566779A (en) 1945-01-12

Family

ID=9979556

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11075/43A Expired GB566779A (en) 1943-07-08 1943-07-08 Improvements in electrical signalling systems

Country Status (5)

Country Link
US (1) US2421169A (enrdf_load_stackoverflow)
ES (1) ES166712A1 (enrdf_load_stackoverflow)
FR (1) FR932188A (enrdf_load_stackoverflow)
GB (1) GB566779A (enrdf_load_stackoverflow)
NL (1) NL63260C (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB575294A (en) * 1944-01-12 1946-02-12 Automatic Telephone & Elect Improvements in or relating to telephone systems
US2623164A (en) * 1948-11-01 1952-12-23 Automatic Elect Lab Single channel, single frequency, mobile radio telephone system
US2740841A (en) * 1953-01-16 1956-04-03 Itt Automatic rural crossbar switching system
US3234514A (en) * 1958-12-12 1966-02-08 Int Standard Electric Corp Electric pulse signalling system having switching means connected to a constant-voltage source
DE1762060A1 (de) * 1967-03-31 1970-04-30 Nippon Electric Co Zwischenamtswaehlsystem fuer ein Fernsprech-Waehlvermittlungsnetz

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1137223A (en) * 1914-03-02 1915-04-27 Western Electric Co Machine telephone switching system.
US1367583A (en) * 1918-04-02 1921-02-08 Bornett L Bobroff System for signaling
US1600358A (en) * 1923-12-27 1926-09-21 Coventry Autom Telephones Ltd Remote-control system
US1778077A (en) * 1924-10-11 1930-10-14 American Telephone & Telegraph Remote-control system

Also Published As

Publication number Publication date
NL63260C (enrdf_load_stackoverflow)
ES166712A1 (es) 1944-08-16
FR932188A (fr) 1948-03-15
US2421169A (en) 1947-05-27

Similar Documents

Publication Publication Date Title
US3436488A (en) Line circuit for a key telephone system utilizing a single multifunction supervisory relay
US3582562A (en) Key telephone intercommunication system
US3397288A (en) Telephone patching circuit
US4408102A (en) Two-wire exchange telephone system
US3689705A (en) System for party line signalling using re-encoded ringing signals
GB566779A (en) Improvements in electrical signalling systems
US3626101A (en) Loop extender for subscribers connected to a central office by abnormally long telephone lines
US2717925A (en) Party line selective signalling system having code and conference call
US3133995A (en) Call awaiting signal telephone circuits
US2549719A (en) Executive's and secretary's trunk connective intercommunication and signal system
US2919310A (en) Pulse transmitter system
US1763157A (en) Telephone system
US2332966A (en) Code call system
US2855463A (en) Telephone system involving the dialing of extension stations at a cordless p. b. x
US2324341A (en) Telephone system
US1337310A (en) Telephone system
US3489857A (en) Trunk connection arrangement for private telephone exchange
US3538260A (en) Dial controlled remote-to-local exchange repeater for a private exchange
US2213511A (en) Telephone system
US2105898A (en) Telephone exchange system
US3041410A (en) Delay busy circuit
US2753401A (en) Busy verification
JPS5612164A (en) Automatic dialing device
US2187945A (en) Telephone system
US1974062A (en) Program distribution system