US PATENT SUBCLASS 122 / 226
.~.~.~ Casing

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

209.1  DF  SECTIONAL {9}
*  DD  .~ Vertical sections {4}
225 R  DF  .~.~ Transversely positioned {6}
226.~.~.~ Casing {1}
227  DF  .~.~.~.~> Divided section

DEFINITION

Classification: 122/226

(under subclass 225) Devices with an inclosing casing, so that the products of combustion come into contact with the outer edges of the sections.

SEE OR SEARCH THIS CLASS, SUBCLASS:

345, for similar art in water tube boilers.