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Person

Kiyoshi Masui

A man wearing glasses and a white lab coat stands against a neutral background.

Japanese veterinarian who, with colleagues Isao Hashimoto and Juro Oyama, codified vent sexing in the mid-1920s and published the definitive method in 1933. Masui's classification of cloacal configurations turned a folk technique into a teachable trade and underwrote a hundred-year Japanese dominance of the profession. He spent the rest of his career at Nagoya, training successive cohorts of sexers.

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