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2469846
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Patent number 2,469,846
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Issue date May 10, 1949
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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2438385
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Patent number 2,438,385
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Issue date Mar 23, 1948
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...