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Emergency backflow system
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Patent number 6,779,553
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Issue date Aug 24, 2004
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Michael A. Heidger
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Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
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3845599
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Patent number 3,845,599
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Issue date Nov 5, 1974
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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3173442
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Patent number 3,173,442
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Issue date Mar 16, 1965
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E03 - WATER SUPPLY SEWERAGE
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2915083
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Patent number 2,915,083
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Issue date Dec 1, 1959
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E03 - WATER SUPPLY SEWERAGE
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1935530
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Patent number 1,935,530
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Issue date Nov 14, 1933
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E03 - WATER SUPPLY SEWERAGE
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1469790
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Patent number 1,469,790
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Issue date Oct 9, 1923
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E03 - WATER SUPPLY SEWERAGE
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1366028
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Patent number 1,366,028
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Issue date Jan 18, 1921
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E03 - WATER SUPPLY SEWERAGE
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1318545
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Patent number 1,318,545
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Issue date Oct 14, 1919
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E03 - WATER SUPPLY SEWERAGE
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1245703
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Patent number 1,245,703
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Issue date Nov 6, 1917
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E03 - WATER SUPPLY SEWERAGE
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1128528
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Patent number 1,128,528
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Issue date Feb 16, 1915
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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1123705
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Patent number 1,123,705
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Issue date Jan 5, 1915
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E04 - BUILDING
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1109740
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Patent number 1,109,740
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Issue date Sep 8, 1914
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E03 - WATER SUPPLY SEWERAGE
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1088066
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Patent number 1,088,066
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Issue date Feb 24, 1914
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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989359
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Patent number 989,359
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Issue date Apr 11, 1911
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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880975
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Patent number 880,975
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Issue date Mar 3, 1908
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E03 - WATER SUPPLY SEWERAGE
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765749
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Patent number 765,749
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Issue date Jul 26, 1904
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E03 - WATER SUPPLY SEWERAGE
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741330
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Patent number 741,330
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Issue date Oct 13, 1903
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E03 - WATER SUPPLY SEWERAGE
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669042
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Patent number 669,042
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Issue date Feb 26, 1901
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E03 - WATER SUPPLY SEWERAGE
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597822
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Patent number 597,822
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Issue date Jan 25, 1898
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E03 - WATER SUPPLY SEWERAGE
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526666
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Patent number 526,666
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Issue date Sep 25, 1894
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E03 - WATER SUPPLY SEWERAGE
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526649
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Patent number 526,649
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Issue date Sep 25, 1894
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E03 - WATER SUPPLY SEWERAGE
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419717
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Patent number 419,717
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Issue date Jan 21, 1890
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E03 - WATER SUPPLY SEWERAGE
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413307
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Patent number 413,307
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Issue date Oct 22, 1889
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E03 - WATER SUPPLY SEWERAGE
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380083
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Patent number 380,083
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Issue date Mar 27, 1888
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E03 - WATER SUPPLY SEWERAGE