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3520137
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Patent number 3,520,137
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Issue date Jul 14, 1970
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3517508
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Patent number 3,517,508
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Issue date Jun 30, 1970
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3516879
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Patent number 3,516,879
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Issue date Jun 23, 1970
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3228868
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Patent number 3,228,868
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Issue date Jan 11, 1966
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3170281
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Patent number 3,170,281
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Issue date Feb 23, 1965
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3108431
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Patent number 3,108,431
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Issue date Oct 29, 1963
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3069840
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Patent number 3,069,840
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Issue date Dec 25, 1962
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3034291
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Patent number 3,034,291
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Issue date May 15, 1962
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2944385
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Patent number 2,944,385
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Issue date Jul 12, 1960
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2930684
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Patent number 2,930,684
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Issue date Mar 29, 1960
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2811431
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Patent number 2,811,431
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Issue date Oct 29, 1957
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1772695
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Patent number 1,772,695
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Issue date Aug 12, 1930
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