Hi Group,  Neil Stevenson asked for information on the Rudolph Piano
Company.  The "Pierce Piano Atlas, 10th Edition" lists the following
information:

 "Rudolph Piano Co., 863 E. 14th St., New York, now being made
  by Winter Est. 1903."

If you can post the your piano's serial number the year of manufacture
can be looked up.  The year 1903 started with serial number 1910 and
the last listing is for the year 1949 which started with serial number
254000.

"Winter & Co., Owned by Aeolian Corp. ... 863 E. 141 St., New York."
The Rudolph name was controlled by Winter.  The Winter listings are
from 1900 serial number 4000 to 1982 with serial number 452400.

Jack M. Conway, Los Angeles, California, USA