US PATENT SUBCLASS 122 / 68
.~.~.~ Water 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}
58 R  DF  .~.~ Drop water firebox {11}
68.~.~.~ Water tube {3}
*  DD  .~.~.~.~> Feed heater {1}
70  DF  .~.~.~.~> Feeding air
71  DF  .~.~.~.~> Solid baffle

DEFINITION

Classification: 122/68

(under subclass 58) Devices with some form of water chamber, conduits or tubes in the firebox.