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Neyen - Screw plane, German Patent 222868 of 1910 (1910)
Emil Neyen · leaf 3
Fig. 4 … Sn En N \ 7\ | STERBEN = 7 9 x] Sy IL oe x am 2 022 Ss ee (m I Sog: HH zen. Ir — 17 X SH NSIn OA | ER LIA ı) I) LEN, „I NPatents · German patents · Aircraft · Flying machines · Helicopters
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