US PATENT SUBCLASS 122 / 241
.~ Firebox in drum

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

235.11  DF  WATER TUBE {52}
241.~ Firebox in drum

DEFINITION

Classification: 122/241

(under subclass 235) Water tube boilers having a drum, within which the firebox is located.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50, and 80, for analogous art.