US PATENT SUBCLASS 122 / 180
.~.~.~.~ Spur water tube

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

135.1  DF  FLUE {4}
155.1  DF  .~ Vertical {16}
166.1  DF  .~.~ With internal water tube {12}
178  DF  .~.~.~ Vertical aligned fire tube {2}
180.~.~.~.~ Spur water tube

DEFINITION

Classification: 122/180

(under subclass 178) Devices having spur water tubes within the large flue.

SEE OR SEARCH THIS CLASS, SUBCLASS:

133, for vertical fire tube boilers having spur water tubes.

173, and 181, for vertical flue boilers having spur water tubes without the vertically alined fire tubes.

186, for vertical flue boilers having a spur water tube stand pipe within the flue.