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1897506
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Patent number 1,897,506
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Issue date Feb 14, 1933
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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1810283
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Patent number 1,810,283
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Issue date Jun 16, 1931
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...