US PATENT SUBCLASS 126 / 365
.~.~ Circulation

Current as of: June, 1999
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126 /   HD   STOVES AND FURNACES

344  DF  WATER HEATERS {7}
364  DF  .~ Stovepipe {1}
365.~.~ Circulation

DEFINITION

Classification: 126/365

(under subclass 364) Devices which are provided with circulation-pipes between the heater and an adjacent tank or reservoir. These heaters have the character and function of "water-backs".