There's a few, but none look like the right one:
http://www.sigma-elec.co.jp/http://www.sigmadenshi.com/company_data.html...even more not listed.
I've had 20 of their units go through my hands easily and I don't recall seeing anything remotely like their company info on any of the paperwork... kind of weird for Japan. Then I remember that I'm no spring chicken and mildly stupid after years of abusing myself.
So I went to dig a bit and found
this.
Address is:
654-0054
兵庫県神戸市須磨区本町2-1-40
シグマ電子
Another address (I believe previously, until 2006)
兵庫県三木市志染町広野5−254
based on
this image.
Supposedly their wiki:
https://w.atwiki.jp/sigma-denshi/Anyway, that's a start. Off the top of my head, Shou is probably the best person to ask about this. Not sure what his email / PM response time is these days though.
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