US PATENT SUBCLASS 122 / 273
.~ Longitudinal upper drum

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

235.11  DF  WATER TUBE {52}
273.~ Longitudinal upper drum {1}
274  DF  .~.~> Fluid fuel

DEFINITION

Classification: 122/273

(under subclass 235) Water tube boilers having an upper longitudinal drum with miscellaneous types of water tubes

communicating therewith not provided for in the definitions of other water tube boiler subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

275+, for similar structure in looped water tube boilers.

291+, 298, 312, 346, 347, 351, and 357, for more specifically associated longitudinal upper drums.

324+, for similar structure in straddle tube boilers.