US PATENT SUBCLASS 122 / 171
.~.~.~ Contracted inlet

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}
171.~.~.~ Contracted inlet

DEFINITION

Classification: 122/171

(under subclass 166) Devices, with the inlet opening to the flue of smaller diameter than the flue, and having water tubes within the flue. There may or may not be a water firebox below the contracted inlet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

175, and 179, for similar art.