What's the difference between electric and fiber-optic slip rings?
Slip ring - Wikipedia
igus® cable reel without a slip ring -now in a new compact design
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OD12.4mm 18 Channel 2A - ZER-X1A - Slipring Elektrik A.S.
90 Amp 3 Wire Slip Ring for Wind Turbine Generators
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Digital Slip Ring | Ethernet and USB Slip Ring • Michigan Scientific