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Wiki information Heuckelbach:

Johannes Heuckelbach
Professional Boxer, Athlete, Boxer, Martial Artist, Olympic athlete, Measured person, Person, Deceased Person

Johannes Hendricus Heuckelbach was a Dutch boxer who competed in the 1920 Summer Olympics. In 1920 he was eliminated in the first round of the welterweight class after losing his fight to Ivan Schannong of Denmark.