Handwritten notes, diagrams and news clippings on devices to control automatically the speed of cars approaching railroad crossings and other dangers through magnets imbedded in highway which would act on devices in cars to control speed
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: 1924 - 1927
container: label: Container
content: Box 2A, Folder 1
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials