US PATENT SUBCLASS 219 / 52
.~.~ Methods

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

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
51  DF  .~ Chain {1}
52.~.~ Methods

DEFINITION

Classification: 219/52

(under subclass 51) Methods.