US PATENT SUBCLASS 219 / 684
.~.~.~ Tunnel type

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

678  DF  MICROWAVE HEATING {15}
680  DF  .~ With diverse-type heating {2}
681  DF  .~.~ Convection heating {3}
684.~.~.~ Tunnel type

DEFINITION

Classification: 219/684

Tunnel type:

(under subclass 681) Subject matter wherein the convection

heating takes place in an elongated hollow cavity with opening or closing ends.

SEE OR SEARCH THIS CLASS, SUBCLASS:

698+, for a microwave tunnel furnace.