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DC Gearbox TT Motor to LEGO® compatible Cross Axle : ID 3810 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: PHYNEDI Goshfun 11Pcs Upgraded Motor Power Modification Building Set for Lego Technic, 4X L-Motor, 1x Servo-Motor, 1x Battery Box, 3X LED Module, 1x Remote, 1x Extended Cord : Toys & Games
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Amazon.com: LEGO Technic Power Functions Motor Set 8293 (10 Pieces) (Discontinued by Manufacturer) : Toys & Games
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