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Guide To U.S. Patents For Windmills and Wind Engin
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Guide To U.S. Patents For Windmills and Wind Engin
In Stock
$ 16.00   
Describes U.S. patent history, especially as it pertains to windmill improvements between 1793 and 1950. Compiled by T. Lindsay baker as a T.I.M.S. publication in 2004. 120 pages. $16.00.