US PATENT SUBCLASS 122 / 165
.~.~ Internal water heater

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}
165.~.~ Internal water heater

DEFINITION

Classification: 122/165

(under subclass 155) Devices within which is some form of water heater other than water tubes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

160, and 185, for allied art.

166+, for vertical flue boilers having internal water tubes.