Collection primarily consists of records, technical notes, and drawings of the company, left by Robert J. Van de Graaff at the time of his death in 1967. The records describe both RJV's work as chief scientist at HVEC between 1947 and 1967, and the development and marketing of research tools during that period. Includes administrative records, annual reports, agendas, financial records, project proposals, correspondence, and technical reports related to projects, including the development of accelerators, and electromagnetic and neutron generators at HVEC. Includes correspondence about filing for patents for the Van de Graaff generator.