Can't find any numbers, names, or markings on any of the windows or pieces. Two windows and cranks are no longer functional. We have taken everything apart to attempt to fix it with no luck. The windows will only move outward to open but not back inward to close.
Tom from SWISCO responded:
July 29, 2020
This operator looks similar to our 39-025. Carefully look it over and let me know what you think!