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    3159364

    • Patent number 3,159,364
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    2753135

    • Patent number 2,753,135
    • Issue date Jul 3, 1956
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    2646235

    • Patent number 2,646,235
    • Issue date Jul 21, 1953
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    2396189

    • Patent number 2,396,189
    • Issue date Mar 5, 1946
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    2320574

    • Patent number 2,320,574
    • Issue date Jun 1, 1943
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    2306269

    • Patent number 2,306,269
    • Issue date Dec 22, 1942
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    1973007

    • Patent number 1,973,007
    • Issue date Sep 11, 1934
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    1918426

    • Patent number 1,918,426
    • Issue date Jul 18, 1933
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    1784784

    • Patent number 1,784,784
    • Issue date Dec 9, 1930
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    1728621

    • Patent number 1,728,621
    • Issue date Sep 17, 1929
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    1526674

    • Patent number 1,526,674
    • Issue date Feb 17, 1925
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    1501530

    • Patent number 1,501,530
    • Issue date Jul 15, 1924
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    1377858

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    • Issue date May 10, 1921
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