US PATENT SUBCLASS 420 / 41
.~.~ Lead, bismuth, antimony, calcium, selenium or tellurium containing

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

8  DF  FERROUS (I.E., IRON BASE) {24}
34  DF  .~ Nine percent or more chromium containing {14}
41.~.~ Lead, bismuth, antimony, calcium, selenium or tellurium containing

DEFINITION

Classification: 420/41

Lead, bismuth, antimony, calcium, selenium or tellurium containing:

(under subclass 34) Alloy or metallic composition which additionally contains at least one of lead, bismuth, antimony, calcium or tellurium.

(1) Note. These materials are commonly added in small amounts to improve the machinability of the alloy.