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Metal DC Geared Motor - 6V 20RPM 7.5Kg.cm - DFRobot
DC 12V 1:1000 Gear Ratio 20RPM/30RPM/40RPM Gear Motor Large Gear Motor DIY N20 Electric Reduction Motor 30PRM - Walmart.com
Gear Motor Gearbox Micro Speed Reduction DC 6V 12V 20RPM-1000RPM Powerful Torque | eBay
Bringsmart 60ktyz 20rpm Ac Motor Low Noise Gearbox Electric Motor Barbecue High Torque Low Speed 110V Synchronous AC Reduction Motor (110V 20rpm) - - Amazon.com
DC 24V 20RPM 4mm Shaft Dia Gear Box Speed Reducing Electric Motor - Overstock - 18445868
Walfront DC Worm Gear Motor 12V High Torque Reduction Gear Box with Encoder Srong Self-Locking 6mm Output Shaft(20RPM)