History of AC power plugs and sockets

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Prior to that time, all louvered sockets still followed the old Lange design of including a raised bead around the bottom of the tube to strengthen it. Shade fitters were added to the socket by means of a complicated little screw clamp that was mounted over this bead. In 1912, Bryant came up with the idea of replacing the bead on the socket tube with a ring of fine threads that would accept accept their new screw-on "UNO" shade fitter. From 1915 on, all of the other manufacturers adopted the UNO threaded tube and began to phase out their beaded version as redundant.


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These hazards and reported problems involved right-angle, locking, and straight parallel-blade plugs. This problem can usually be traced to tinned wires or to inadequate tightening.

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