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3676235
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Patent number 3,676,235
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Issue date Jul 11, 1972
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2908560
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Patent number 2,908,560
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Issue date Oct 13, 1959
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2839374
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Patent number 2,839,374
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Issue date Jun 17, 1958
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2602732
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Patent number 2,602,732
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Issue date Jul 8, 1952
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2275569
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Patent number 2,275,569
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Issue date Mar 10, 1942
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1139339
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Patent number 1,139,339
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Issue date May 11, 1915
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1038292
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Patent number 1,038,292
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Issue date Sep 10, 1912
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988244
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Patent number 988,244
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Issue date Mar 28, 1911
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751807
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Patent number 751,807
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Issue date Feb 9, 1904
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