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Partial rotation encoding 
The interrupter disk has 40 slits covering only 120° of rotation. There are three photodetectors to monitor the slots and two other indexing apertures. The driven ≈0.47" end is a barrel cam accepting a ≈0.15" pin with ≈0.15" throw and a face cam with ≈0.04" throw. The Faulhaber #1624 motor with 16/5 gearhead listed here may have been the driving part of this device.
Partial encoder 
This cannot be used for 360 degrees rotation as the encoder grid does not go 360 degrees around the wheel. It also will not turn in reverse so it cannot be used for rocking back and forth for the few degrees it does have encoder slits for. I do not consider this a to be an encoder in the usual sense of the word. It must have the actual degrees it encodes added to the description as in xx degrees encoder. I am not even going to spend the time trying to determine what degrees that is as I do not know of a use for these things. (Had to give it one star as the system would not accept zero.)
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