US PATENT SUBCLASS 122 / *
.~.~ Over firebox

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

235.11  DF  WATER TUBE {52}
305  DF  .~ Spur {8}
*.~.~ Over firebox {3}
314  DF  .~.~.~> Central header
315  DF  .~.~.~> Declined
316  DF  .~.~.~> Horizontal