US PATENT SUBCLASS 122 / 221
.~.~ Annularly positioned

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

209.1  DF  SECTIONAL {9}
*  DD  .~ Vertical sections {4}
221.~.~ Annularly positioned {1}
222  DF  .~.~.~> Central magazine

DEFINITION

Classification: 122/221

(under subclass 209) Sectional boilers having vertically disposed sections around the combustion chamber.