Hamuro swam the traditional breaststroke, while some of his competitors used the butterfly stroke, which was allowed at the time.
Between 1935 and 1940 Hamuro never lost a race and won ten national breaststroke titles.
After World War II he worked for the Mainichi newspaper as a sports journalist.
[2] Hamuro's wife was also a swimmer and a world champion in the masters category.
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