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2838912
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Patent number 2,838,912
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Issue date Jun 17, 1958
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2815648
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Patent number 2,815,648
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Issue date Dec 10, 1957
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...