Interview with Koretoshi Maruyama

Koretoshi Maruyama Sensei was born in Nihonbashi, Tokyo, on 5 October 1936. He graduated from the Economics Department of Keio University in March 1956 and joined his father’s business, Maruyama Manufacturing. He became interested in the martial arts during his middle school years and at his father’s urging, practiced Judo and earned a black belt.

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