ElekTek Special Safety Switch Lamp Bulb Holder B22 BC Bayonet Shade Ring, 1/2” 26TPI Bottom Entry, Brass, Child Safe Switch Push Bar Locks Off to Cut Power if lamp Bulb not Inserted -
Bayonet mount - Wikipedia
Bayonet B22 BC Ceramic Lamp Bulb Holder With Side Fixings, Replacement Coughtrie | eBay
Metal Bayonet Lampholder Wiring & Testing - YouTube
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