Came across this interesting Butler vertical slotter on FB Marketplace:
Its relatively small compared to the other Butler slotters I can find online, and I can't find any info about this particular model.
Seems to be about 4" stroke, and apparently fully automatic in that you can configure the number of teeth for a gear/spline using the change gears, then set the depth of cut etc and just let it go.

Anyone happen to have seen/used one before or have any information about them?
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