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3593465
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Patent number 3,593,465
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Issue date Jul 20, 1971
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B24 - GRINDING POLISHING
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3545140
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Patent number 3,545,140
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Issue date Dec 8, 1970
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B24 - GRINDING POLISHING
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3417513
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Patent number 3,417,513
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Issue date Dec 24, 1968
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B24 - GRINDING POLISHING
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3348342
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Patent number 3,348,342
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Issue date Oct 24, 1967
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B24 - GRINDING POLISHING