US PATENT SUBCLASS 219 / 669
.~.~.~ Polyphase

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

600  DF  INDUCTIVE HEATING {7}
660  DF  .~ With power supply system {3}
661  DF  .~.~ Power switching {4}
669.~.~.~ Polyphase

DEFINITION

Classification: 219/669

Polyphase:

(under subclass 661) Subject matter wherein the power supply provides two or more phases of alternating current.