I have a Motor Player Corporation unit.  It says "Electric Vacuum
Pumps for Player Pianos" and has a patent date of 10-28-19.  It is
11" high, 8" wide, 15" deep with an additional 1-1/2" required for
a fitting.  It is 110 VAC and runs, although it should probably be
looked at by an electrician if you were actually going to use it.
Price is $50 plus shipping and handling from Southwest Missouri.

Bob Stewart

 [ Articles about the Motor Player Corp. turbine pump are indexed
 [ at http://www.mmdigest.com/Archives/KWIC/C/corp.html 
 [ -- Robbie