US PATENT SUBCLASS 122 / 479.4
.~.~ With variable firing

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}
479.4.~.~ With variable firing

DEFINITION

Classification: 122/479.4

With variable firing:

(under subclass 479.1) Devices wherein the firing order of the burners can be changed.