US PATENT SUBCLASS 420 / 4
.~ Iron base

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

1  DF  RADIOACTIVE {5}
4.~ Iron base

DEFINITION

Classification: 420/4

Iron base:

(under subclass 1) Alloy or metallic composition which contains over 50 percent iron.