hifi engine

Need Owners Manual for RG Dynamics Pro-16 and Pro-20

I'm looking for the owners manuals for the Pro-16 and Pro-20 models of Dynamic Processors from RG Dynamics Inc. (the father of the Pioneer RG Processors). Robert Grodinsky, based in Skokie, Illinois, USA manufactured these in the early 80's.
Any help in locating manuals for either or both of these units is greatly appreciated.