MFC closed in 1917.
The machine Akro patented in 1915 was not significantly different from the machine MFC used. Horace Hill took the machine designs from MFC and tweaked them -- not to improve the design but to be able to claim that he had a machine sufficiently different so that he could get his own patent on the tech he stole from MFC. It was later determined by a court that his machine wasn't different enough from MFC's and Akro shouldn't have gotten that patent.
If I recall correctly.
Even if the U.S. did help Japan out in the postwar era maybe the help took the form of machine designs, not necessarily the machines themselves.
Again, not sure where I got this impression, but for some reason I thought that part of the help the U.S. gave to other countries may have been in disseminating Hartford Empire tech.
If that's the case with Japan then it could be that the help the U.S. gave to Japan was to help them change over from transitionals which they may have had pre-war to gob fed marbles postwar.
And then Japan quickly jumped from that to cat's eyes.