Private company

Shinwa Rules is a Japanese company based in Niigata Prefecture, founded in 1971.¹

シンワ測定株式会社（しんわそくてい、Shinwa Rules Co.,Ltd. ）は、新潟県三条市に本社を置く測定機器メーカー。² From the Japanese Wikipedia, CC BY-SA 4.0

Last updated Oct 21, 2026.