US PATENT SUBCLASS 122 / 426
.~.~.~ Water tube

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

412  DF  FEED HEATERS {17}
*  DD  .~ Horizontal fire tube boiler {2}
423  DF  .~.~ Smoke box {3}
426.~.~.~ Water tube

DEFINITION

Classification: 122/426

(under subclass 423) Feed water heaters consisting of either water tubes located in smokebox or of a water walled casing, forming the smokebox, provided with water tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

465, for similar structure used as a steam superheater.