1,817,036 Rate changing device, 1931
name: label: Collection Creator
content: Condon, Robert B.
label: Collection Creator
content: Condon, Robert Scofield, 1896-1973 (engineer)
setName: label: See more items in
content: Robert Scofield Condon Engineering Papers
label: See more items in
content: Robert Scofield Condon Engineering Papers / Series 2: Patents / 2.2: United States Patents
container: label: Container
content: Box 2, Folder 7
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials