Great sounding 2VCO monosynth. The 60F was mfg. under licence from ARP as denoted by the tag on the rear. However someone comments that looking up the patent information the only thing lisenced to them was the use of the pressure pad technology and also for the 110F and SX-400. The filter on the 110F though is similar to Moog. And the VCO's have the familiar uA726 of course used in many 70's designs. Lots of op amps. Don't really see anything in the circuitry that ARP could have patented, so that's probably right.
Haven't seen one of these yet.
I should have many parts for these. Contact me if you need something.