Is shown on this video at 0:43.
Going back to Motown - YouTube
https://m.youtube.com/watch?v=CpqD3IHdXxM#fauxfullscreen
It is possibly the Cinema Engineering type 4031-B.
Information on this EQ and possibly schematic too can be found in the brilliant Audio Cyclopedia.
It would be interesting to read the patent document. Possibly by espacenet search on Cinema Engineering?
Reference:
Audio Cyclopedia - Howard M. Tremaine
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