A bit of googling finds this Japanese article, and DeepL does a really impressive English translation, which I am mostly just going to quote, with a bit of corrections.
1960: prototype of fully automatic SAPTON typesetting machine announced
1962: SAPTON-F numeric-only typesetting machine delivered to Japanse Defence Agency
1965: SAPTON-N ...
In photo typesetting four basic generations can be distinguished
Generation (1950s): Modified Linotype style machines. Here the metal matrices were modified to carry a character negative to be projected, but otherwise work like before.
Generation (1960s): Purpose build photo typesetting. A smaller examples is the Diatype, but large integrated ...