X-Y switching demonstration
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 John M. Ridd, Total Communications Services
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1987.0426.01
label: accession number
content: 1987.0426
objectType: label: Object Name
content: Telephone Demonstration Switch
physicalDescription: label: Measurements
content: overall: 20 cm x 89 cm x 27 cm; 7 7/8 in x 35 1/32 in x 10 5/8 in