Braun radio tube and an instruction manual for use of an oscillograph tube
name: label: Collection Collector
content: United States. National Bureau of Standards
setName: label: See more items in
content: National Bureau of Standards Radio Collection
unitdate: label: Date
content: 1920-1922
container: label: Container
content: Box 1, Folder 7
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials