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Neyen - Screw plane, German Patent 222868 of 1910 (1910)

Emil Neyen · leaf 1

An illustration from Neyen - Screw plane, German Patent 222868 of 1910, 1910, leaf 1 — Zu der Patentschrift 2 2 2 8 6 8 Blatt 1.

Patents · German patents · Aircraft · Flying machines · Helicopters

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