US PATENT SUBCLASS 122 / 89
.~.~.~ Rear of fire tube

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}
*  DD  .~.~ Water arch {1}
89.~.~.~ Rear of fire tube

DEFINITION

Classification: 122/89

(under subclass 51) Devices provided with a water-cooled arch over the combustion chamber at the rear of the fire tubes. This arch may be formed of plates spaced apart or of water tubes or water tubes combined with solid material like firebrick.