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Chiseling apparatus
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Patent number 5,180,210
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Issue date Jan 19, 1993
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David M. Lister
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B08 - CLEANING
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3188710
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Patent number 3,188,710
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Issue date Jun 15, 1965
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E04 - BUILDING
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3135561
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Patent number 3,135,561
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Issue date Jun 2, 1964
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E04 - BUILDING
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1332232
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Patent number 1,332,232
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Issue date Mar 2, 1920
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E04 - BUILDING