US PATENT SUBCLASS 122 / 235.33
.~ With convection zone regulation


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

235.11  DF  WATER TUBE {52}
235.33.~ With convection zone regulation


DEFINITION

Classification: 122/235.33

With convection zone regulation:

(under subclass 235.11) Devices wherein means are provided to control the flow of combustion gases.