US PATENT SUBCLASS 122 / 306
.~.~ Bridge wall header

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

235.11  DF  WATER TUBE {52}
305  DF  .~ Spur {8}
306.~.~ Bridge wall header

DEFINITION

Classification: 122/306

(under subclass 305) Devices having a vertical header located at the bridge wall, and in which the spur tubes extending over the firebox and in rear thereof or extending in the rear of the firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

280, for boilers of similar structure provided with looped tubes.