US PATENT SUBCLASS 420 / 502
.~ Copper containing

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

501  DF  SILVER BASE {3}
502.~ Copper containing {2}
503  DF  .~.~> Other noble metal containing
504  DF  .~.~> Zinc, or cadmium containing

DEFINITION

Classification: 420/502

Copper containing:

(under subclass 501) Alloy, or metallic composition which additionally contains copper.