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3900339
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Patent number 3,900,339
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Issue date Aug 19, 1975
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B08 - CLEANING
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3899348
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Patent number 3,899,348
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B08 - CLEANING
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B08 - CLEANING
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Patent number 2,256,663
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B08 - CLEANING
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Patent number 1,716,165
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Issue date Jun 4, 1929
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B08 - CLEANING