Helicopter Aircraft with Free-Spinning Rotor, patent specifications
name: label: Collection Inventor
content: Lemelson, Jerome H., 1923-1997
setName: label: See more items in
content: Jerome H. Lemelson Papers
label: See more items in
content: Jerome H. Lemelson Papers / Series 3: Abstracts and Specifications for Patents
unitdate: label: Date
content: 1968
container: label: Container
content: Box 64, Folder 8
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Text