US PATENT SUBCLASS 122 / 278
.~.~.~ Cross

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

235.11  DF  WATER TUBE {52}
275  DF  .~ Loop {3}
*  DD  .~.~ Over firebox {5}
278.~.~.~ Cross

DEFINITION

Classification: 122/278

(under subclass 275) Devices in which the loops cross each other over the firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

311, for crossed spur water tubes over the firebox.

355, for crossed zigzag tubes.