US PATENT SUBCLASS 303 / 82
.~.~ By action of control-pipe pressure

Current as of: June, 1999
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303 /   HD   FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS

*  DD  RELEASING {3}
81  DF  .~ Control pipe {2}
82.~.~ By action of control-pipe pressure

DEFINITION

Classification: 303/82

Upon a sudden fall in pipe-pressure a valve is opened to permit a momentary discharge of fluid into the external atmosphere.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37, 38 for similar action.