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Ball valve lockout
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Patent number 6,622,536
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Issue date Sep 23, 2003
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Prinzing Enterprises, Inc.
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Robert Fuller
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Switch lockouts
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Patent number 5,577,599
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Issue date Nov 26, 1996
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Prinzing Enterprises, Inc.
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Mark E. Turek
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H01 - BASIC ELECTRIC ELEMENTS
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Switch lockouts
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Patent number 5,310,969
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Issue date May 10, 1994
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Prinzing Enterprises, Inc.
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Mark E. Turek
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H01 - BASIC ELECTRIC ELEMENTS