Published by Mähr-Ostrau, Germany: ND.
Seller: Wittenborn Art Books, San Francisco, CA, U.S.A.
Manuscript / Paper Collectible Signed
Condition: Good. Typed document, signed. From Albert Herrmann, Mähr-Ostrau [Germany]. Undated. Patent for new propeller design to increase flight speed. Signed in pencil. Pencil notations, apparently by Caproni, expressing interest. 8-1/4 x 12-5/8 inches. Perforated twice for insertion into binder. Folded once horizontally and once vertically for mailing. Small tear at bottom edge; paperclip shadow at upper left. Very Good. Also attached is a drawing of the proposed design, stamped with Hermann's name and address. 7 x 6-1/4 inches. Very Good.