Box 5
Container
Call Number: RH MS 564
Contains 15 Results:
Lists of rotor tests and rotor patents and patent applications filed by Hays 1930 to 1945, with 3 rotor drawings [from envelope labeled "Aircraft patents, 1935-1945"]
File — Box: 5, Folder: 6
Published descriptions and illustrations of Hays inventions (U. S. Patent Office)
File — Box: 5, Folder: 8
Hays patents issued by U. S. Patent Office, 1936-1950 [originals, bearing Patent Office seal]
File — Box: 5, Folder: 9.1
Letter from Th. von Karman, October 17, 1934; also list of names and addresses of Hays references
File — Box: 5, Folder: 10
Correspondence with Harold W. Zipp (Boeing Airplane Company), Hays rotary aircraft design drawings, and records of Hays/Boeing negotiations and agreement, 1942-1943
File — Box: 5, Folder: 13
Letter from Mitchell Zurawinski (Cessna Aircraft Company), August 14, 1944, including attachment with drawings, photograph, photonegatives ("Studies of Stability in Stall")
File — Box: 5, Folder: 14