The Hughes Tool Company series (1912-1990) encompasses the administrative, financial, and legal management of Hughes Tool Company. Materials within the series depict Howard Hughes' control of the company; his film, aeronautics, electronics, and real estate ventures; and his lawsuits and United States Senate hearing. The series also includes research reports on the corporate history of Hughes Tool Company and its subsidiaries, copyright histories for films Hughes produced, and correspondence from Hughes' associates searching for reels of Hughes' films domestically and internationally.