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3865659
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Patent number 3,865,659
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Issue date Feb 11, 1975
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3706608
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Patent number 3,706,608
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Issue date Dec 19, 1972
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3537923
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Patent number 3,537,923
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Issue date Nov 3, 1970
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3488237
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Patent number 3,488,237
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Issue date Jan 6, 1970
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3370537
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Patent number 3,370,537
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Issue date Feb 27, 1968
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3092528
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Patent number 3,092,528
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Issue date Jun 4, 1963
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3088857
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Patent number 3,088,857
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Issue date May 7, 1963
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2942965
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Patent number 2,942,965
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Issue date Jun 28, 1960
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2861875
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Patent number 2,861,875
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Issue date Nov 25, 1958
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2452091
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Patent number 2,452,091
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Issue date Oct 26, 1948
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2038097
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Patent number 2,038,097
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Issue date Apr 21, 1936
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