US PATENT SUBCLASS 122 / 42
FIRE AND WATER TUBE

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

42FIRE AND WATER TUBE {1}
43  DF  .~> Fluid fuel

DEFINITION

Classification: 122/42

(under the class definition) Boilers provided with both water tubes and fire tubes not otherwise provided for.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53+, 68+ and 98, for horizontal fire tube boilers with water tubes.

113, for analogous art.

130+, for vertical fire tube boilers provided with water tubes.

138, 140+, 149+, and 152, for horizontal flue boilers with water tubes. 153+, and 166+, for vertical flue boilers provided with water tubes.

195+, for horizontal cylindrical boilers with water tubes.