Irving Nachumsohn. US Patent 3,217,312, Traveling Message Sign Control Apparatus Having Rotating Members Which Bear Switch Activating Elements
name: label: Collection Inventor
content: Naxon, Irving , 1902-1989
setName: label: See more items in
content: Irving Naxon Papers
label: See more items in
content: Irving Naxon Papers / Series 4: Patent and Trademark Materials
unitdate: label: Date
content: 1965
container: label: Container
content: Box 2, Folder 17
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials