signal, electromagnetic
notes: label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Transportation, Railroad
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: TR.308409
label: catalog number
content: 308409
objectType: label: Object Name
content: Signal, Electromagnetic
label: Other Terms
content: Signal, Electromagnetic; Rail