US PATENT SUBCLASS 122 / 148
.~.~.~ Water firebox

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}
148.~.~.~ Water firebox

DEFINITION

Classification: 122/148

(under subclass 140) Devices having a water firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

77, for similar art.

141, for horizontal flue boilers with a drop water firebox, with water tubes in the flue, running longitudinally.

146, for horizontal flue boilers with transverse water tubes and with a drop water firebox.