US PATENT SUBCLASS 122 / *
.~.~ Plural upper transverse drum

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

235.11  DF  WATER TUBE {52}
*  DD  .~ Rearwardly declined {3}
*.~.~ Plural upper transverse drum {2}
301  DF  .~.~.~> Plural lower transverse drum
302  DF  .~.~.~> Single lower transverse drum