US PATENT SUBCLASS 303 / 9
.~.~ Supplementary in emergency

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

5  DF  MULTIPLE FLUID-RECEIVING DEVICES {1}
6.01  DF  .~ Multiple motors {6}
9.~.~ Supplementary in emergency

DEFINITION

Classification: 303/9

Upon a heavy reduction of control-pipe pressure a second motor is brought into operation.