US PATENT SUBCLASS 122 / 38
.~.~ Draft regulator

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

37  DF  COMPARTMENT {1}
*  DD  .~ Auxiliary {1}
38.~.~ Draft regulator

DEFINITION

Classification: 122/38

(under subclass 37) Devices at least one compartment being for heating water to operate a motor for regulating the combustion of the boiler furnace.