Text, "This machine bores a tunnel 6 feet in diameter at the rate of a 100 to 500 lineal feet per 24 hours,"
name: label: Series Creator
content: Warshaw, Isadore, 1900-1969
setName: label: See more items in
content: Warshaw Collection of Business Americana, Series 2: Other Collection Divisions
label: See more items in
content: Warshaw Collection of Business Americana, Series 2: Other Collection Divisions / Series 3: Glass Plate Negatives
container: label: Container
content: Box 18, Item 8
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Negatives