US PATENT SUBCLASS 122 / 235.12
.~ Wall structure

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

235.11  DF  WATER TUBE {52}
235.12.~ Wall structure

DEFINITION

Classification: 122/235.12

Wall structure:

(under subclass 235.11) Devices having specific wall structure of the water tubes.