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Grinding disc
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Patent number 4,237,589
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Issue date Dec 9, 1980
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Leland H. Boothe
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Grinding apparatus
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Patent number 4,085,899
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Issue date Apr 25, 1978
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Leland Harman Boothe
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...