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2934648
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Patent number 2,934,648
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Issue date Apr 26, 1960
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B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...
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2756840
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Patent number 2,756,840
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Issue date Jul 31, 1956
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B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...