US PATENT SUBCLASS 122 / 143
.~.~.~ Spur

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

135.1  DF  FLUE {4}
136 R  DF  .~ Horizontal {7}
140.1  DF  .~.~ Internal water tube {7}
143.~.~.~ Spur

DEFINITION

Classification: 122/143

(under subclass 140) Devices having spur water tubes in the flue.