US PATENT SUBCLASS 122 / 363
.~.~.~ Drum


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

235.11  DF  WATER TUBE {52}
*  DD  .~ Headers {1}
360  DF  .~.~ Closures and couplings {4}
363.~.~.~ Drum


DEFINITION

Classification: 122/363

(under subclass 360) Subject matter comprising the structure of headers of the drum type and tube connections therefor and closures for the drum hand holes when the drum structure is involved.

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365, for general structure of drums for water tube boilers.

393, for the structure of mud drums and modifications in boilers for their application.

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220, Receptacles, 200+, for closures of general application.