US PATENT SUBCLASS 122 / *
.~.~ 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}
*.~.~ Water tube {4}
*  DD  .~.~.~> Horizontal {1}
103  DF  .~.~.~> Rear of fire tube
*  DD  .~.~.~> Rearwardly declined {1}
*  DD  .~.~.~> Rearwardly inclined {1}