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3561316
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Patent number 3,561,316
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Issue date Feb 9, 1971
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2941438
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Patent number 2,941,438
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Issue date Jun 21, 1960
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...