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  • CPC
  • H04M5/10
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HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M5/00Manual exchanges

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H04M5/10using separate plug for each subscriber
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Patents Grantslast 30 patents

  • Information Patent Grant

    3489859
    • Patent number 3,489,859
    • Issue date Jan 13, 1970
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3406261
    • Patent number 3,406,261
    • Issue date Oct 15, 1968
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2790853
    • Patent number 2,790,853
    • Issue date Apr 30, 1957
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2780676
    • Patent number 2,780,676
    • Issue date Feb 5, 1957
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2727948
    • Patent number 2,727,948
    • Issue date Dec 20, 1955
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2726285
    • Patent number 2,726,285
    • Issue date Dec 6, 1955
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2644042
    • Patent number 2,644,042
    • Issue date Jun 30, 1953
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2605363
    • Patent number 2,605,363
    • Issue date Jul 29, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2577759
    • Patent number 2,577,759
    • Issue date Dec 11, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2568138
    • Patent number 2,568,138
    • Issue date Sep 18, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2532889
    • Patent number 2,532,889
    • Issue date Dec 5, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2516815
    • Patent number 2,516,815
    • Issue date Jul 25, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2502820
    • Patent number 2,502,820
    • Issue date Apr 4, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2468749
    • Patent number 2,468,749
    • Issue date May 3, 1949
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2435302
    • Patent number 2,435,302
    • Issue date Feb 3, 1948
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2379987
    • Patent number 2,379,987
    • Issue date Jul 10, 1945
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2366604
    • Patent number 2,366,604
    • Issue date Jan 2, 1945
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2320957
    • Patent number 2,320,957
    • Issue date Jun 1, 1943
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2292471
    • Patent number 2,292,471
    • Issue date Aug 11, 1942
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2209513
    • Patent number 2,209,513
    • Issue date Jul 30, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2208924
    • Patent number 2,208,924
    • Issue date Jul 23, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2206659
    • Patent number 2,206,659
    • Issue date Jul 2, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2184268
    • Patent number 2,184,268
    • Issue date Dec 26, 1939
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2181668
    • Patent number 2,181,668
    • Issue date Nov 28, 1939
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2167069
    • Patent number 2,167,069
    • Issue date Jul 25, 1939
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2143398
    • Patent number 2,143,398
    • Issue date Jan 10, 1939
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2140930
    • Patent number 2,140,930
    • Issue date Dec 20, 1938
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2139249
    • Patent number 2,139,249
    • Issue date Dec 6, 1938
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2107158
    • Patent number 2,107,158
    • Issue date Feb 1, 1938
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2083404
    • Patent number 2,083,404
    • Issue date Jun 8, 1937
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents