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Angle dual check valve
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Patent number 5,207,242
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Issue date May 4, 1993
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A. Y. McDonald Mgf. Co.
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Joseph L. Daghe
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E03 - WATER SUPPLY SEWERAGE
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Tamperproof rotary valve
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Patent number 5,102,098
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Issue date Apr 7, 1992
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A. Y. McDonald Manufacturing Company
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Joseph L. Daghe
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Tamperproof rotary valve
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Patent number 5,076,541
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Issue date Dec 31, 1991
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A. Y. McDonald Manufacturing Company
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Joe L. Daghe
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Tamperproof rotary valve
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Patent number 4,984,767
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Issue date Jan 15, 1991
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A. Y. McDonald Mfg. Co.
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Joe L. Daghe
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...