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1661179
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Patent number 1,661,179
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Issue date Mar 6, 1928
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Issue date Feb 6, 1923
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A46 - BRUSHWARE
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Patent number 1,420,104
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Issue date Jun 20, 1922
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A46 - BRUSHWARE
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Patent number 1,125,351
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Issue date Jan 19, 1915
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A46 - BRUSHWARE