Portions of the corporate records of these seven companies and the records of the merged corporation form this collection. By the 1960s, the firm employed almost 500 emplyees in East Rochester. Fischer, Foster-Armstrong Co., and the Wm. Foremost among them were Chickering & Sons, Mason & Hamlin, J. Each company brought with it subsidiary companies. The corporation's offices and factory were located in East Rochester, New York. (incorporated 1887) and the American Piano Co. The Aeolian American Piano Corporation was formed in 1932 with the merger of two prominent piano manufacturers, The Aeolian Co. The Aeolian American Piano Corporation Collection contains the extant records and design drawings of the world's largest piano manufacturer of the early 20th century. Aeolian American Corporation - History.Materials include: 300 trade catalogs and advertising pieces 25 ledgers and daybooks 50 blueprints for pianos 10 volumes of piano patents 90 photographs 20 master rolls for making player piano rolls 15 folders of papers and correspondence 35 monographs and 25 newspaper issues.