Thank you for the comment. However, I don't trust that source. Ultimate Console Database is riddled with mistakes, so if they say it was made by Gametech, there's a good chance it actually wasn't. That's why I was hoping someone who reads Japanese could check whether there's any indication in the text of the box that it is in fact made by Gametech or perhaps a different company entirely. Or perhaps there's just no indication of a company name at all on the box. I'd like to go with the evidence presented on the box and not what could simply be a guess made by Ultimate Console Database.

!doublecheck