US PATENT SUBCLASS 420 / 457
.~ Copper containing

Current as of: June, 1999
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420 /   HD   ALLOYS OR METALLIC COMPOSITIONS

441  DF  NICKEL BASE {6}
457.~ Copper containing {1}
458  DF  .~.~> Iron containing

DEFINITION

Classification: 420/457

Copper containing:

(under subclass 441) Alloy, or metallic composition which additionally contains copper.