US PATENT SUBCLASS 122 / 448.4
.~ Once through

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

448.1  DF  AUTOMATIC CONTROL OF FLUID FUEL AND WATER {3}
448.4.~ Once through

DEFINITION

Classification: 122/448.4

Once through:

(under subclass 448.1) Devices wherein the fluid is turned to steam on a single circuit through the heater.