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Frost-free vent assembly
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Patent number 8,574,045
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Issue date Nov 5, 2013
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Dina Warner
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Security air vent
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Patent number 6,575,826
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Issue date Jun 10, 2003
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Tom H. Myint
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F24 - HEATING RANGES VENTILATING
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3162130
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Patent number 3,162,130
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Issue date Dec 22, 1964
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E03 - WATER SUPPLY SEWERAGE
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2781163
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Issue date Feb 12, 1957
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E03 - WATER SUPPLY SEWERAGE
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2457863
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Patent number 2,457,863
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Issue date Jan 4, 1949
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E03 - WATER SUPPLY SEWERAGE
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2447173
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Patent number 2,447,173
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E03 - WATER SUPPLY SEWERAGE
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1685099
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Issue date Sep 25, 1928
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E03 - WATER SUPPLY SEWERAGE
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1587728
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Issue date Jun 8, 1926
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E03 - WATER SUPPLY SEWERAGE
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1567448
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Patent number 1,567,448
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Issue date Dec 29, 1925
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E03 - WATER SUPPLY SEWERAGE