US PATENT SUBCLASS 420 / 537
.~.~ Silicon containing

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

528  DF  ALUMINUM BASE {7}
529  DF  .~ Copper containing {6}
537.~.~ Silicon containing

DEFINITION

Classification: 420/537

Silicon containing:

(under subclass 529) Alloy, or metallic composition which additionally contains silicon.