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2620709
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Patent number 2,620,709
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Issue date Dec 9, 1952
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2410913
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Patent number 2,410,913
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Issue date Nov 12, 1946
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2271753
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Patent number 2,271,753
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Issue date Feb 3, 1942
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2267181
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Patent number 2,267,181
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Issue date Dec 23, 1941
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR