US PATENT SUBCLASS 420 / 521
.~ Copper containing

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

513  DF  ZINC BASE {4}
521.~ Copper containing {1}
522  DF  .~.~> Manganese, iron, cobalt, or nickel containing

DEFINITION

Classification: 420/521

Copper containing:

(under subclass 513) Alloy, or metallic composition which additionally contains copper.