US PATENT SUBCLASS 454 / 45
.~.~ Including breech opening

Current as of: June, 1999
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454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
44  DF  .~ Having lining or sleeve {3}
45.~.~ Including breech opening

DEFINITION

Classification: 454/45

Including breech opening:

(under subclass 44) Subject matter comprising a side opening in a lower part of the vertical conduit section for entrance of air or products of combustion.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

500+, for an open recess fireplace in a chimney.