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Ring circuit - Wikipedia
StainleSs Steel Ss Council Ring Socket, Size: 25mm
Light Socket Shade Rings,Aluminum Threaded Socket Ring for Medium Base E26 Sockets,Retaining Rings for Glass Lamp Shades/Light Fixtures (4-Pack White Color/For Thread Diameter 1-1/2 Inches) - Amazon.com
Ring final circuits
Candelabra Socket Ring for half Thread Phenolic Lamp Socket
3/8" DR. 12 Point Flexible Ring Socket Wrench-KING TONY-3350M
Metal Mobile Phone Ring Holder Telephone Cellular Support Accessories Magnetic Car Bracket Socket Stand For Mobile Phones | Fruugo TR
Museum of Plugs and Sockets: ring and radial circuits