US PATENT SUBCLASS 420 / 587
.~ Copper containing

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

580  DF  CONTAINING OVER 50 PER CENT METAL BUT NO BASE METAL {4}
587.~ Copper containing

DEFINITION

Classification: 420/587

Copper containing:

(under subclass 580) Alloy, or metallic composition containing copper in an amount which does not exceed 50 percent by weight.