US PATENT SUBCLASS 122 / 55
.~.~ Cylinder

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

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
55.~.~ Cylinder

DEFINITION

Classification: 122/55

(under subclass 51) Subject matter relating to the structure of single cylindrical boilers.

(1) Note. The Horizontal cylindrical subclasses for the boiler features without the fire tubes.