US PATENT SUBCLASS 122 / 205
.~.~.~ Multiple series

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

*  DD  HORIZONTAL CYLINDER {6}
195  DF  .~ Water tube {7}
*  DD  .~.~ Water grate {5}
205.~.~.~ Multiple series

DEFINITION

Classification: 122/205

(under subclass 195) Devices having a plurality of fire grates, one or more of which are of the water tube type and so arranged that the products of combustion from one grate pass over or through the other grate.