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3530747
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Patent number 3,530,747
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Issue date Sep 29, 1970
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2362071
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Patent number 2,362,071
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Issue date Nov 7, 1944
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2080638
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Patent number 2,080,638
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Issue date May 18, 1937
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B27 - WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL NAILING OR STAPLING MACH...
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1721678
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Patent number 1,721,678
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Issue date Jul 23, 1929
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR