发明授权
US3601644A Speed regulation device for swing machine motors 失效
用于旋转电机的速度调节装置

Speed regulation device for swing machine motors
摘要:
The invention relates to a device which permits the operator of a home-type sewing machine to regulate the speed thereof. The machine motor is of the commutator-type and is provided with a hand-manipulable knob member for varying the brush holder position.
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