US PATENT SUBCLASS 303 / 77
.~.~.~ Control-pipe pressure

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

*  DD  RELEASING {3}
68  DF  .~ Motor {5}
75  DF  .~.~ Preventers {4}
77.~.~.~ Control-pipe pressure

DEFINITION

Classification: 303/77

The release of the motor is prevented by a valve responsive to changes of pressure in the brake-pipe.