| 摘要 |
A toy with sound-activated motion is provided The toy comprises a toy bod y, a single motor within the body, adapted to turn in opposite directions in response to changes in electrical polarity, and control means to automatica lly reverse the polarity of an electrical current being supplied to the moto r in response to an acoustical or electromagnetic input signal The control m eans is adapted to automatically reverse the polarity in response to a chang ing acoustical or electromagnetic input signal
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