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|Olympic medal record|
|Men's Artistic Gymnastics|
|1896 Athens||Team parallel bars|
|1896 Athens||Team horizontal bar|
Hillmar won two gold medals as a member of the German team that won both of the team events, the parallel bars and the horizontal bar. He had less success in the individual events, contesting the parallel bars, horizontal bar, vault, and pommel horse without earning any medals.
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