US PATENT SUBCLASS 122 / 22
FLUID AND SOLID FUEL

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

22FLUID AND SOLID FUEL

DEFINITION

Classification: 122/22

(under the class definition) Boilers not otherwise classifiable heated by solid or fluid fuel or both combined.

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211, for sectional boilers heated by solid or fluid fuel.