The Allen D. Cardwell Manufacturing Corporation was a major producer of radio and telecommunications equipment during the twentieth century. Cardwell sold its products to the United States Government, major corporations, and individual consumers. The records contain technical information such as patents and design drawings, as well as a vast array of sales and promotional material from the 1920s.

Charles A. Rosencrans (1908-1991) was an RCA engineer who specialized in radio transmission. His notebooks largely consist of fragmentary handwritten notes from both his career at RCA and from his studies in electrical and mechanical engineering at Lehigh University.

The Sidney Cooper photographs contain 47 prints, both color and black and white, as well as a handful of paper documents. These images and documents illustrate work done in the 1960s and 1970s on audio amplifiers, Spectra 70, and the ICBM Minutemen Computer.