National Museum of American History
P.O. Box 37012
MRC 601/Room 1100
Washington, DC 20013-7012
6.0 cubic ft.
Charles Adler, a professional engineer and inventor began his career as an inventor at the age of 14, receiving a patent for on an electric automotive brake. While associated with the Maryland Pennsylvania Railroad, he developed a series of safety devices and in 1928 developed and installed in Baltimore the first traffic actuated signal device for automobiles. He was granted over 60 U.S. patents for devices in general use. The collection contains biographical materials, newspaper clippings, scrapbooks, photographs, memorabilia, published writings, and patent applications.