Negative 73, Heavy duty back blocks used on Duquesne Steel works engine
name: label: Collection Creator
content: Cooper-Bessemer Corporation (Mt. Vernon, Ohio)
setName: label: See more items in
content: Cooper-Bessemer Corporation Records
label: See more items in
content: Cooper-Bessemer Corporation Records / Glass Plate Negatives
unitdate: label: Date
content: undated
container: label: Container
content: Box 47
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Negatives