US PATENT SUBCLASS 122 / 393
.~ Mud drum

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

379  DF  CLEANING {9}
393.~ Mud drum

DEFINITION

Classification: 122/393

(under subclass 379) Devices comprising mud drums and the necessary modifications in the boiler structure for their application.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52, 137, 192, for drums forming bridgewalls for horizontal cylindrical boilers.

259, 363, 365, for water tube boiler drums.

444, for drums for water tube boilers with special feed heating means.