Western Electric type 221D vacuum tube
date: label: date made
content: ca 1927
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: A general purpose tube designed for Bell affiliate, Northern Electric of Canada; similar to the UV201A. Reference: Tyne, "Saga of the Vacuum Tube," pages 295-297.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.320965
label: accession number
content: 241556
label: catalog number
content: 320965
objectType: label: Object Name
content: triode
physicalDescription: label: Measurements
content: overall: 4 1/2 in x 1 3/4 in; 11.43 cm x 4.445 cm