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Hollow drilling tool
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Patent number 5,069,584
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Issue date Dec 3, 1991
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Hilti Aktiengesellschaft
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Josef Obermeier
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B28 - WORKING CEMENT, CLAY, OR STONE
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Hollow drilling tool
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Patent number 4,966,502
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Issue date Oct 30, 1990
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Hilti Aktiengesellschaft
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Eugen Magyari
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B28 - WORKING CEMENT, CLAY, OR STONE