There was some discussion recently about how many player pianos were
manufactured.  I ran across the following in the 1914 edition of the
Scientific American Reference Book:

  "In 1909 ... manufactured in the United States: ... The whole number
of pianos manufactured was 365,154, valued at $59,501,25.  Of these,
there were

  365,413 upright pianos, valued at $55,462,556;
  330,413 pianos without player attachment, valued at $46,187,555;
  34,495 pianos for or with player attachment, valued at $9,275,001;
  8,741 grand pianos, valued at $4,038,669.

There were 10,898 player attachments made separate from pianos,
valued at $1,474,630. ..."

Hope this information is of value.
Wayne Finger