Ashton Valve Company, "The Ashton Improved Standard Locomotive Pop Safety Valve"
name: label: Collection Collector
content: National Museum of American History (U.S.). Division of Work and Industry
setName: label: See more items in
content: Railroad Trade Literature Collection
label: See more items in
content: Railroad Trade Literature Collection / Series 1: Trade Literature / 1.12: American Steel Foundries
unitdate: label: Date
content: circa 1912
container: label: Container
content: Box 15, Folder 16
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials