File History for United States Patent No. 4,151,989 basketball practice device
name: label: Collection Creator
content: Ehrat, Arthur
label: Collection Creator
content: Fleckner, John A., 1941-
setName: label: See more items in
content: Arthur Ehrat Papers
label: See more items in
content: Arthur Ehrat Papers / Series 4 : Licensing Agreements / 4.6: William Dittrich Patents
unitdate: label: Date
content: 1977-1979
container: label: Container
content: Box 14, Folder 3
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials