US PATENT SUBCLASS 122 / 290
.~.~.~ Front and rear header

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}
*  DD  .~.~ Over bridge wall {1}
290.~.~.~ Front and rear header {4}
291  DF  .~.~.~.~> Horizontal-longitudinal drum {3}
295  DF  .~.~.~.~> Internal water tube
296  DF  .~.~.~.~> Longitudinal-declined drum
297  DF  .~.~.~.~> Transverse drum

DEFINITION

Classification: 122/290

(under subclass 235) Water tube boilers having banks of water tubes rearwardly declined over the bridge wall and being in communication with a front header or drum and a rear header or drum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

265, 297, 331, and 474, for analogous structure.