Origin of high vacuum tube
name: label: Collection Creator
content: Espenschied, Lloyd, 1889-? (electrical engineer)
setName: label: See more items in
content: Lloyd Espenschied Papers
label: See more items in
content: Lloyd Espenschied Papers / Series 1: Subject Files
container: label: Container
content: Box 6
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials