1915年に建築家の横河民輔氏が東京・渋谷で興した電気計器研究所が起源。
1917年に電流計・電圧計・電力計を国産化し、1975年発表の総合制御システムCENTUMでプラント制御の柱を築いた。売上の大半を制御事業が占め、中東・アフリカなど海外の石油・ガス設備へ制御システムを納める。
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