Minarik Electric MotorMaster 20000 Series. DC (direct current) motor speed controller, manufactured by Minarik Electric Company – Glendale, California, USA. Well preserved, in good aesthetic and internal condition (see photos). Ideal for industrial electronics enthusiasts, collectors, or vintage technical applications. Model: MotorMaster 20000 Series. Front controls: Power ON/OFF switch and speed adjustment knob (0-100%). Equipped with rear heat sink and original Minarik components. Terminal interface for internal wiring (see photos). Made in USA – robust and reliable product. ? Note: Not recently tested. No guarantee of functionality. Ideal for repair, spare parts, collection, or retrofit use. ? What’s included. 1x Minarik MotorMaster 20000 Series controller.