U.S. Patent Office
name: label: Collection Creator
content: Hammer, William J. (William Joseph), 1858-1934 (electrical engineer)
setName: label: See more items in
content: William J. Hammer Collection
label: See more items in
content: William J. Hammer Collection / Series 2: Edisonia / 2.13: Litigation Of Edison Patents
container: label: Container
content: Box 39, Folder 1
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
scopecontent: label: Scope and Contents note
content: Specification of Letters of Patent No.1,264,560, patented April 30, 1918; and Specification of Letters of Patent No. 1,203,601, patented June 3,1919