U.S. Patent No. 7,537,229
Unicycle with auxiliary wheels
Inventor: Pao-Kung Wu
From the specification:
"The unicycle has only one wheel such that the ride skill of the unicycle is more difficult than that of a bicycle. As a result, some people give up learning to ride the unicycle because they often fall from the seat of the unicycle and gradually lose his/her confidence of riding unicycle during learning. It's a pity."
A pity, indeed.
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