1. Repetitive-Pulse Stimulators Cardiac Pacemakers for Research Applications Creator: General Electric Company Date: [ca. 1964] Genre: Brochures
2. GE cardiac pacemaker instruction manual Creator: General Electric Company Date: [ca. 1966] Genre: Manuals (instructional materials)
3. Letter from W. H. Duehren to Adrian Kantrowitz Creator: General Electric CompanyDuehren, W. H. Date: July 1966 Genre: Letters (correspondence)
4. Letter from W. H. Duehren to Adrian Kantrowitz Creator: General Electric CompanyDuehren, W. H. Date: 18 January 1966 Genre: Letters (correspondence)