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    3912278

    • Patent number 3,912,278
    • Issue date Oct 14, 1975
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    3220739

    • Patent number 3,220,739
    • Issue date Nov 30, 1965
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    2744212

    • Patent number 2,744,212
    • Issue date May 1, 1956
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    2582939

    • Patent number 2,582,939
    • Issue date Jan 15, 1952
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