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Related to grinding mills
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Patent number 4,863,109
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Issue date Sep 5, 1989
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National Research Development Corporation
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Peter M. Standring
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Mill for grinding granular material
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Patent number 4,807,818
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Issue date Feb 28, 1989
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National Research Development Corporation
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Peter M. Standring
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Rotary forging
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Patent number 4,795,333
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Issue date Jan 3, 1989
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National Research Development Corporation
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Peter M. Standring
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...