US PATENT SUBCLASS 110 / 174
.~ Feeding air and steam
Current as of: June, 1999
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DEFINITION
Classification: 110/174
(under subclass 173) Doors through which air and steam or steam are fed to the fire and also where air and steam or steam is fed to the fire when the valve controlling the admission of the fluid is operated by the door, whether the fluid passes through the door or not.
SEE OR SEARCH THIS CLASS, SUBCLASS:
192, for time limit controls.
