US PATENT SUBCLASS 122 / 235.21
.~.~ Multiple D-type tubes

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

235.11  DF  WATER TUBE {52}
235.19  DF  .~ D-type tube {1}
235.21.~.~ Multiple D-type tubes

DEFINITION

Classification: 122/235.21

Multiple D-type tubes:

(under subclass 235.19) Devices wherein the water tubes have plural squared patterns.