US PATENT SUBCLASS 122 / 224
.~.~.~ 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}
223  DF  .~.~ Longitudinally positioned {1}
224.~.~.~ Casing

DEFINITION

Classification: 122/224

(under subclass 223) Devices, having an inclosing casing spaced apart from the sections to allow passage for the products of combustion around the sections.