A night lamp, which includes a lamp socket holding a bulb, and a power input plug fastened to the lamp socket at one side for power input, wherein the power input plug includes a body coupled to lamp socket at one side to hold two metal blades for insertion into an electric outlet and an annular metal...http://www.google.se/patents/US6093028?utm_source=gb-gplus-sharePatent US6093028 - Night lamp with side mounting type rotary powder input plug
