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3561303
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Patent number 3,561,303
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Issue date Feb 9, 1971
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3493170
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Patent number 3,493,170
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Issue date Feb 3, 1970
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3448643
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Patent number 3,448,643
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Issue date Jun 10, 1969
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2974642
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Patent number 2,974,642
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Issue date Mar 14, 1961
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR