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1643760
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Patent number 1,643,760
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Issue date Sep 27, 1927
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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1596635
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Patent number 1,596,635
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Issue date Aug 17, 1926
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...