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It appears to be a motor-generator set that takes 60 Hz 3 phase input at 10 kW, and puts out 400Hz AC. I base that on this page that I found with a Google search for the NSN.
https://www.aviationpurchasingplatform.com/nsn/rfq/kurz-and-root-generator-company-llc/6125007248947/kurtmd2/