US PATENT SUBCLASS 122 / 479.2
.~.~ Having gas recirculation


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

459  DF  STEAM TREATMENT {7}
479.1  DF  .~ Automatic heat regulation of superheater {6}
479.2.~.~ Having gas recirculation


DEFINITION

Classification: 122/479.2

Having gas recirculation:

(under subclass 479.1) Devices wherein the products of combustion are returned to an earlier stage of combustion.