De Forest type DV7 "Audion" triode
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.320337
label: catalog number
content: 320337
label: accession number
content: 242269
objectType: label: Object Name
content: vacuum tube
label: Object Name
content: electron tube
label: Object Name
content: triode
physicalDescription: label: Measurements
content: overall: 4 1/8 in x 1 3/8 in; 10.4775 cm x 3.4925 cm