Control Tech. Corp 3930 Series servo controllers ?

Just bought a couple of Control Tech Corp 3930 Servo controllers off of ebay. They appear to be DC motor with encoder inputs.
The inputs may be serial. Anyone have ANY info on these. One is a single servo type , the other is dual servo. Both appear to have built in power supplies.
Thanks for any info. snipped-for-privacy@mindspring.com
Don Butterworth
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