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File:CD drive DC 5 V 2-phase 4-wire Stepper motor with Leadscrew - (2).jpg - Wikimedia Commons
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Driving a mini 2-phase 4-wire stepper motor - #16 by MarkT - Motors, Mechanics, Power and CNC - Arduino Forum
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Difference Between 4-Wire, 6-Wire and 8-Wire Stepper Motors - NI
Difference Between 4-Wire, 6-Wire and 8-Wire Stepper Motors - NI