US PATENT SUBCLASS 122 / *
.~ Rearwardly declined

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

235.11  DF  WATER TUBE {52}
*.~ Rearwardly declined {3}
*  DD  .~.~> Over bridge wall {1}
*  DD  .~.~> Over firebox {1}
*  DD  .~.~> Plural upper transverse drum {2}