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Aviation History
1947
1947 - 0985.PDF
FLIGHTJune 19. 1947 (le Havilland constant-speed quick-feathering pjj^ller type 3/1000/2 The first braking -propeller to obtain e - a p p r o v a 1 D E HAVILLAND BRAKING PROPE LLE RS P R O f 11, L f H i
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