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U.S. patents available from 1976 to present.
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Sir William Preece, chief engineer, British Post Office ; 1878

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Number of patents: 1
Last date: February 18, 2003

Number	Title	Issue Date
6520740	Energy efficient fan One or more fan blades extend radially from a hub that is freely rotatable relative to a main drive shaft. The hub is coupled to the drive shaft so that, when the drive shaft is moved through an orbital path in a cyclical motion, the hub moves in a twirli...	02/18/2003