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3207001
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Patent number 3,207,001
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Issue date Sep 21, 1965
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B24 - GRINDING POLISHING
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3128582
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Patent number 3,128,582
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Issue date Apr 14, 1964
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B24 - GRINDING POLISHING
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2961806
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Patent number 2,961,806
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Issue date Nov 29, 1960
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B24 - GRINDING POLISHING
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2733560
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Patent number 2,733,560
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Issue date Feb 7, 1956
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B24 - GRINDING POLISHING