The affiliated and subsidiary companies sub-series (1930-1975) consist of corporate materials from companies associated with or operated beneath companies owned by Howard Hughes. These materials primarily include administrative records detailing the management of the Howard Hughes Medical Institute (HHMI) and Hughes Aircraft Company (HAC). Materials for HHMI are dated from 1954 to 1962 and include reports, administrative correspondence, records of proceedings held with the United States Internal Revenue Service, and a manuscript of the institute’s goals and accomplishments. The HAC materials are dated from 1930 to 1975 and include a board-mounted floor plan for a temporary television studio, records from a congressional hearing regarding the HAC, reports for the development of high-speed cameras and a satellite, and schematic drawings for camera equipment.