Johnson, Mark W., gyration spiral turbines
name: label: Collection Creator
content: James Leffel and Company
setName: label: See more items in
content: James Leffel and Company Records
label: See more items in
content: James Leffel and Company Records / Series 2: Patent Materials
unitdate: label: Date
content: 1922
container: label: Container
content: Box 8, Folder 4
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials