US PATENT SUBCLASS 122 / 73
.~.~.~ Drop water firebox

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}
72  DF  .~.~ Projecting into firebox {1}
73.~.~.~ Drop water firebox

DEFINITION

Classification: 122/73

(under subclass 72) Devices projecting into a drop water firebox.