US PATENT SUBCLASS 122 / 113
.~.~ Water tube

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

44.1  DF  FIRE TUBE {11}
*  DD  .~ Transverse {3}
113.~.~ Water tube

DEFINITION

Classification: 122/113

(under subclass 44) Devices having fire tubes extending transversely through the boiler and also having water tubes in communication with the boiler.