US PATENT SUBCLASS 122 / *
.~.~.~.~ In fire tube

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

459  DF  STEAM TREATMENT {7}
*  DD  .~ Fire tube boiler {3}
*  DD  .~.~ Horizontal {1}
461  DF  .~.~.~ Superheater {3}
*.~.~.~.~ In fire tube {1}
462  DF  .~.~.~.~.~> From smoke box