US PATENT SUBCLASS 122 / *
.~.~.~ Superposed

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

412  DF  FEED HEATERS {17}
441  DF  .~ Steam {1}
442  DF  .~.~ Injected {1}
*.~.~.~ Superposed {1}
443  DF  .~.~.~.~> Open to steam space