US PATENT SUBCLASS 110 / 321
.~.~ Door arch

Current as of: June, 1999
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110 /   HD   FURNACES

317  DF  INCLUDING FIREBOX {1}
318  DF  .~ Having arch {3}
321.~.~ Door arch

DEFINITION

Classification: 110/321

Door arch:

(under subclass 318) Apparatus wherein the arch extends from the front of the combustion chamber over the combustion reaction.