US PATENT SUBCLASS 122 / 359
.~.~ Over firebox

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

235.11  DF  WATER TUBE {52}
355  DF  .~ Zigzag {3}
359.~.~ Over firebox

DEFINITION

Classification: 122/359

(under subclass 355) Devices whose tubes are located over the firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

249, and 258, for zigzag boilers having tubes over the firebox when the flow of fluid is in a downward direction.

356, for zigzag boilers heated by fluid fuel.