News clippings, correspondence and photos  on traffic signal actuated by sound of horn
name: label: Collection Creator
content: Adler, Charles, Jr., 1899-1980 (engineer, inventor)
setName: label: See more items in
content: Charles Adler, Jr. Collection
label: See more items in
content: Charles Adler, Jr. Collection / Series 2: Scrapbooks and Clippings
unitdate: label: Date
content: 1926 - 1928
container: label: Container
content: Box 2, Folder 2
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials