Tunnel shield for concrete lining (patent drawings)
name: label: Collection Creator
content: Forgie, James
setName: label: See more items in
content: James Forgie Papers
label: See more items in
content: James Forgie Papers / Series 1: Professional Papers
unitdate: label: Date
content: 1911 - 1912
container: label: Container
content: Box 4, Folder 6
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials