US PATENT SUBCLASS 122 / 215
.~.~.~ Central connection

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

209.1  DF  SECTIONAL {9}
*  DD  .~ Horizontal sections {1}
214  DF  .~.~ Superimposed {3}
215.~.~.~ Central connection {2}
216  DF  .~.~.~.~> Fluid fuel
217  DF  .~.~.~.~> Water firebox

DEFINITION

Classification: 122/215

(under subclass 214) Devices the sections being in communication with one another at their centers.