demonstration for call box circuit operation
notes: label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Western Union Corporation
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.332578
label: catalog number
content: 332578
label: accession number
content: 294351
label: collector/donor number
content: 100-420
objectType: label: Object Name
content: call box demonstration
label: Object Name
content: demonstration unit, circuit
physicalDescription: label: Measurements
content: overall: 18 in x 40 3/4 in x 21 in; 45.72 cm x 103.505 cm x 53.34 cm