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DC Motor Speed Controller Switch, 12V-40V PWM DC Motor Governor Module Variable Speed Controller 10A, 2.95×2.36×1.10in: Amazon.com: Industrial & Scientific
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RioRand 12V-40V 10A PWM DC Motor Speed Controller with Knob-High Efficiency, High Torque, Low Heat Generating with Reverse Polarity Protection, High Current Protection: Electric Motor Controls: Amazon.com: Industrial & Scientific
