US PATENT SUBCLASS 420 / 423
.~ Copper containing

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

422  DF  ZIRCONIUM OR HAFNIUM BASE {1}
423.~ Copper containing

DEFINITION

Classification: 420/423

Copper containing:

(under subclass 422) Alloy, or metallic composition which additionally contains copper.