US PATENT SUBCLASS 122 / 54
.~.~.~ Double outlet

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  .~.~ Central firebox {1}
54.~.~.~ Double outlet

DEFINITION

Classification: 122/54

(under subclass 51) Devices with a firebox located midway its ends, having outlets for the products of combustion opposite each other.