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2625048
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Patent number 2,625,048
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Issue date Jan 13, 1953
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2506241
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Patent number 2,506,241
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Issue date May 2, 1950
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2480273
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Patent number 2,480,273
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Issue date Aug 30, 1949
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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1782746
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Patent number 1,782,746
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Issue date Nov 25, 1930
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...