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US3972297A Sewing machine position and speed sensing system 失效
缝纫机位置和速度感应系统

Sewing machine position and speed sensing system
摘要:
Logic circuit device and frequency voltage converter connected to the impulse preparation device. A gate being interposed between voltage converter and the impulse preparation device. Comparator connected to the converter which compares its output to an adjustable reference voltage.
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