Hi Group,  According to the Pierce Piano Atlas, 10th Edition:
  "Stuyvesant Piano Company, New York 1884 - 147th St. Near Brooklyn Ave.
  See Aeolian Corp. Aeolian American Corp. Est. 1932. Office at 584
  Fifth Avenue, New York.  Aeolian American controlled the following
  piano names: Stuyvesant, Aeolian, Weber Piano & Pianola Co.
  Est. 1903 Worcester, MA.  The following companies were under their
  control: Stuyvesant Piano Company."

According to Presto Buyers' Guide 1926 Ed.:
  "One of the reliable popular pianos made by the great industry of the
  Aeolian Weber Piano & Pianola Co. to which refer in Part Three.  This
  company controls the business of all of the following: Stuyvesant Piano
  Company.

Jack M. Conway, Los Angeles, California, USA