d'Humy, Ferdinand. Birth of the Vacuum Tube
name: label: Collection Creator
content: United Telegraph Workers.
label: Collection Creator
content: Western Union Telegraph Company
setName: label: See more items in
content: Western Union Telegraph Company Records
label: See more items in
content: Western Union Telegraph Company Records / Series 27: Addenda (Series Level) / Addenda for Series 1: Historical Background
unitdate: label: Date
content: 1949
container: label: Container
content: Box 832
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials