US PATENT SUBCLASS 220 / 62.17
.~ Two different metallic layers

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220 /   HD   RECEPTACLES

62.11  DF  RECEPTACLE SIDE WALL MADE OF TWO OR MORE LAYERS OF MATERIAL PERMANENTLY ATTACHED TOGETHER {10}
62.17.~ Two different metallic layers

DEFINITION

Classification: 220/62.17

Two different metallic layers:

(under subclass 62.11) Subject matter wherein the receptacle side wall includes two dissimilar layers of metal.