Taidacent Hollow Slip Ring Rotary Electrical Contact 2/4/6/12 Wires Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (6 Wires 10A Inner Hole 12.7mm OD 54mm) - Amazon.com
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What are slip rings and why do some motors use them?
Slip Ring Connector - AndyMark, Inc
Ethernet Slip Ring - 1000/100/10 Base T by Rotary Systems, Inc.