US PATENT SUBCLASS 303 / 42
.~.~ Emergency preventers

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

28  DF  AUTOMATIC {13}
41  DF  .~ Preliminary valve movement {1}
42.~.~ Emergency preventers

DEFINITION

Classification: 303/42

Devices for preventing an undesired emergency operation of an equalizing-valve after a series of slight reductions in control-pipe pressure.