The video only mentions the presses' manufacture at 1:08:42, where it says "Now some of the 50,000 ton hydraulic press, they had others but that was the heaviest one and that was the one most of you that occurred in most every naval yard for big plates, they only had one. Well that's it everybody they only had one. They only had one because they were gonna buy three more but that recession that scrapped that whole plan. If I remember correctly that press was actually made here in the United States." That's it, and the only source I can find on this states it was made in Japan.Actually it does state the US refused to sell additional presses. It is in the section where the Yamato plate is discussed.