US PATENT SUBCLASS 122 / 497
FRONTS

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

497FRONTS {2}
498  DF  .~> Doors
499  DF  .~> Mouths {1}

DEFINITION

Classification: 122/497

(under the class definition) Subject matter relating to water-cooled fronts for boilers.