Mathematical Problem and Number Generating Systems -U.S. Patent 3,947,976
date: label: date made
content: 1976
notes: label: Description
content: These photocopied sheets have drawings and patent text relating to U.S. Patent 3,947,976. It was an invention of William R. Hafel of Sunnyvale, California, assigned to Eric F. Burtis of Redwood City, California. It was filed March 10, 1975 and granted April 6, 1976.
label: Description
content: For related object, see 1986.0507.01.
label: Location
content: Currently not on view
place: label: place made
content: United States: California, Sunnyvale
setName: label: See more items in
content: Medicine and Science: Computers
creditLine: label: Credit Line
content: Centurion Industries
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.3081.14
label: catalog number
content: 1986.3081.14
label: nonaccession number
content: 1986.3081
objectType: label: Object Name
content: sheets, set of
physicalDescription: label: Physical Description
content: paper (overall material)
label: Measurements
content: overall: 11 in x 8 1/2 in; 27.94 cm x 21.59 cm