4,681,548, Audio visual apparatus and method
name: label: Collection Inventor
content: Lemelson, Jerome H., 1923-1997
setName: label: See more items in
content: Jerome H. Lemelson Papers
label: See more items in
content: Jerome H. Lemelson Papers / Series 2: Patents
unitdate: label: Date
content: 1987-07-21
container: label: Container
content: Box 48, Folder 16
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials
label: Type
content: Text