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Multi-purpose drilling tool
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Patent number 7,401,667
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Issue date Jul 22, 2008
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Robert Bosch GmbH
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Helmut Duscha
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Hole saw
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Patent number 7,384,222
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Issue date Jun 10, 2008
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Walley Chao
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3802520
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Patent number 3,802,520
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Issue date Apr 9, 1974
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B28 - WORKING CEMENT, CLAY, OR STONE
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3778179
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Patent number 3,778,179
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Issue date Dec 11, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE