Three Parker Compumotor servo drives. One each of OEM670T OEM770X OEM770T.
One is missing it's cover.
Literature here http://www.parkermotion.com/literature/OEM770.htm
Condition unknown, I received them in some lots of other stuff I bought and have never tested them. Servos are not my thing and I know very little about them. These are being Sold As Is.
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