By I946, a few Christmas lighting

 By I946, a few Christmas lighting sets were appearing in the stores.

These new sets followed the form of those sets created before the war,

but all were improved in one important detail-the replacement of plastic

or synthetic materials closely bonded to the wire in place of previously

used rubber and fabric insulation. Thus, this insulation could not readily

pull away from the end of the wire where it was attached to the socket,

and so leave the conductor exposed for possible contact with tinsel, bare

metal, or fingers. One further improvement was a deeper socket to allow

the upper edge of the metal base shell to go fully within the socket.

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