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Keyless E26 Medium Base Phenolic Socket,TWDRTDD® Industrial Retro US Standard Pendant Lamp Holder with Lampshade Collar Ring (3, White) - Amazon.com
1pcs White Black 4a 250v E27 Card-type Lamp Holder Ce Certification E27 Socket High Quality - Lamp Bases - AliExpress
Edison screw - Wikipedia
Plastic Lamp Holder with two screw rings and male thread - Black (E27) - Kynda Light
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Edison Screw Type Holder, E27 Type For Pendants and Wall Lamps,PACK OF 3PCS
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Type of bulb holder / sockets and their differences | Woodooz Home Decor®
B&Q Black Edison screw cap (E27) Lampholder | DIY at B&Q
Edison screw pendant type lamp holder | Science Museum Group Collection