black thermoplax flash sign commutator
notes: label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Agriculture
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: AG.A.0738
label: catalog number
content: A.0738
label: accession number
content: 1923.70327
objectType: label: Object Name
content: Black Thermoplax Flash Sign Commutator