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3631730
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Patent number 3,631,730
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Issue date Jan 4, 1972
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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3479891
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Patent number 3,479,891
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Issue date Nov 25, 1969
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...