1960年に片山一郎氏が東京都大田区で設立したユニオン化学研究所が起源。
1970年にプリント配線板用の超硬ドリルの生産を始め、研磨機など工具を製造する機械まで自社で設計してきた。自社推計でPCBドリルの世界市場の約3割を占め、売上の74%は国外向けである。
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