US 417, 086 and US 417, 087 (clutch appliance for elevators)
name: label: Collection Creator
content: Pratt, Charles Richardson, 1860-1935
setName: label: See more items in
content: Charles Richardson Pratt Papers
label: See more items in
content: Charles Richardson Pratt Papers / Series 5: Inventions
unitdate: label: Date
content: 1889 - 1889
label: Date
content: 1891 - 1891
container: label: Container
content: Box 5, Folder 6
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
scopecontent: label: Scope and Contents
content: Agreements with Frank Sprague, John H. Clark, Edward H. Johnson, and Thompson Houston Motor Company