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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