1937年に関家三男氏が広島県呉市で興した工業用砥石の第一製砥所が起源。
1975年に半導体用ダイシングソーを自社開発し、砥石・装置・使い方を一社で抱える体制を構築した。ダイシングソーとグラインダで世界の7割を占める半導体製造装置メーカーで、売上高営業利益率は42%に達する。
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