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Ultrasonic grinder
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Patent number 4,131,238
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Issue date Dec 26, 1978
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Energy and Minerals Research Co.
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William B. Tarpley
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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2518836
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Patent number 2,518,836
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Issue date Aug 15, 1950
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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1787180
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Patent number 1,787,180
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Issue date Dec 30, 1930
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...