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ElekTek Lamp Holder Fixed Batten Bayonet Cap BC B22 With Shade Ring So - Buy It Better
Batten Lamp Holder Chrome Plated with Earth and Shade Ring Bayonet Cap (BC) (B22d) : Amazon.co.uk: Lighting
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ElekTek B15 Miniature Batten Bayonet Cap SBC Light Lamp Bulb Holder Shade Ring | eBay