US PATENT SUBCLASS 122 / 235.19
.~ D-type tube

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

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

DEFINITION

Classification: 122/235.19

D-type tube:

(under subclass 235.11) Devices wherein the water tubes are shaped in a square loop pattern.