US PATENT SUBCLASS 303 / 134
.~.~.~ Compared to fixed reference

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

121  DF  SPEED-CONTROLLED {44}
127  DF  .~ Pneumatic {1}
128  DF  .~.~ For a railway vehicle (e.g., train) {7}
134.~.~.~ Compared to fixed reference

DEFINITION

Classification: 303/134

Compared to fixed reference:

(under subclass 128) Train speed control in which the velocity is contrasting an actual parameter; e.g., speed, acceleration with a previously defined parameter.