These were designed in Binghamton, NY ( hour south of where this vid was filmed) and possibly manufactured there as well. Years back I was volunteering a museum collection called tech works which has several trainers from different eras as well as a good portion of the engineering documentation on them. I think a good portion is on their web site if your interested. <br>Also Tom, I’m impressed you did as well as you with out instruments.,(reply>), Yes!! I've volunteered there before COVID  and Susan was always showing these off. Great place and cool people, especially for an engineering student such as myself. My favorite was the self playing piano. If anyone is ever in Binghamton, definitely visit Techworks if you like old tech.,(reply>), They used to have a replica at Binghamton airport with a little exhibit,(reply>), I remember driving past Link on I-81. Disappointed when it ceased to be Link.