US PATENT SUBCLASS 122 / 396
.~ Systems

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

379  DF  CLEANING {9}
396.~ Systems

DEFINITION

Classification: 122/396

(under subclass 379) Devices comprising apparatus and processes for cleaning and filling boilers where an interchange of heat is effected between the blow-off water and the clean filling water.