| 摘要 |
A motor system is releasably connected to a roller-skate provided with a driving shaft. The motor system comprises a power unit mounted on a frame which can be tied as a kit-bag to a roller-skate body and a flexible connection for transmitting the movement from the power unit to the driving shaft. A releasable clutch is interposed between the flexible connection of the motor system and the driving shaft of the roller skate.
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