U.S. Patent Specifications
Aircraft Engineering and Aerospace Technology
Article publication date: 1 June 1943
A hollow metal blade for a controllable‐pitch propeller having an integral base end flange formed to provide an annular thrust bearing race on one side thereof and a closely adjacent blade turning gear sector, on the opposite side thereof, and a closure member for the base end of said blade carried by said blade and formed to provide a thrust bearing surface opposed to the thrust bearing surface on said flange.
(1943), "U.S. Patent Specifications", Aircraft Engineering and Aerospace Technology, Vol. 15 No. 6, pp. 185-186. https://doi.org/10.1108/eb031030
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