US PATENT SUBCLASS 122 / 67
.~.~.~.~ Intermediate draft

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
58 R  DF  .~.~ Drop water firebox {11}
*  DD  .~.~.~ Water grate {1}
67.~.~.~.~ Intermediate draft

DEFINITION

Classification: 122/67

(under subclass 58) Devices with a plurality of fuel chambers, one of which at least has a water grate, the products of combustion from the fuel chambers meeting each other. The fuel chambers are generally superposed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

66, for boilers of this type when the upper fuel chamber is a coking chamber.

371+, for grate structure.