US PATENT SUBCLASS 122 / *
.~.~.~ Water smoke box

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

135.1  DF  FLUE {4}
136 R  DF  .~ Horizontal {7}
149  DF  .~.~ Return fire tube {2}
*.~.~.~ Water smoke box {1}
151  DF  .~.~.~.~> Separate