US PATENT SUBCLASS 303 / 41
.~ Preliminary valve movement

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

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

DEFINITION

Classification: 303/41

Devices for counteracting the effects of unauthorized valve movements due to slight variations in control-pipe pressure.