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Taidacent 3 Wires 4 Wires 5A 10A 15A 30A Electrical Slip Ring Collector Ring Rotary Electrical Contact Joint Rotary Connector Commutator (4 Wires 30A Diameter 31mm) - Amazon.com
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Slip Ring with Flange - 22mm diameter, 6 wires, max 240V @ 2A : ID 736 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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