US PATENT SUBCLASS 122 / 53
.~.~.~ Water tube

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}
52  DF  .~.~ Plural {1}
53.~.~.~ Water tube

DEFINITION

Classification: 122/53

(under subclass 52) Devices with water tubes in various arrangement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138, for horizontal flue boilers with water tubes.