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Hollow turbine
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Patent number 8,080,913
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Issue date Dec 20, 2011
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William Sheridan Fielder
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F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
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Hollow generator
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Patent number 7,843,099
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Issue date Nov 30, 2010
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William Sheridan Fielder
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F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
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Buoyant rotor
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Patent number 7,348,686
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Issue date Mar 25, 2008
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William Sheridan Fielder
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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Self-winding generator
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Patent number 7,127,886
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Issue date Oct 31, 2006
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William Sheridan Fielder
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...