Pre-print of a lecture before the Royal Aeronautical Society announcing the invention of a helicopter-like aircraft. Brochure announces the lecture to be delivered March 18, 1929. 28pp, wrps, stapled, 2-hole punched, 6.75x8.75", illus with drawings and photos. Good; one horz fold, staple light rust. Interesting design with internal combustion motors and small props at the main rotor blade tips.
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Regular price
$45.00
23-P-421
