I have used those in the past and I thought you could still buy them. They are handy in, for example, the ceiling light fixture in a closet to run a wireless router. They also make ones that have both plugs on the sides and another light socket on the end with a pull chain just for the light. So, as long as the wall switch is on you power the router, and you can also pull the chain to turn on the closet light.
Bass
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