US PATENT SUBCLASS 219 / 146.3
.~.~.~ Particulate

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
146.1  DF  .~ Weld rod composition {6}
146.24  DF  .~.~ Metal deoxidizer or denitrogenizer {1}
146.3.~.~.~ Particulate