US PATENT SUBCLASS 148 / 309
.~.~.~.~ Containing over 1 percent aluminium

Current as of: June, 1999
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148 /   HD   METAL TREATMENT

400  DF  STOCK {20}
300  DF  .~ Magnetic {7}
306  DF  .~.~ Iron base (i.e., ferrous) {3}
307  DF  .~.~.~ Silicon containing {2}
309.~.~.~.~ Containing over 1 percent aluminium

DEFINITION

Classification: 148/309

Containing over 1 percent aluminum:

(under subclass 307) Stock material which additionally contains more than 1 percent aluminum.