You might get the model number and go directly to the vendor.
http://www.baumerhuebner.com/23.0.html?&L=1

I believe those are resolvers used on that unit, but I may be mistaken. If they are resolvers Hubner calls them "Sine" encoders. Good luck.

It Don't mean a thing if it aint got that swing.

Cool, Free, Johnny Smith courtesy of NPR..HERE
http://www.npr.org/ramfiles/asc/asc25.smith.asx