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Books by Archibald Graham and George James Smith-Pert. Forsyth

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ORIGINAL PATENT APPLICATION NUMBER 575,720 FOR IMPROVEMENTS IN OR RELATING TO VARIABLE PITCH PROPELLER SYSTEMS FOR AIRCRAFT AND THE LIKE. (SURREY).
ORIGINAL PATENT APPLICATION NUMBER 575,720 FOR IMPROVEMENTS…
By: Archibald Graham and George James Smith-Pert. Forsyth
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