US PATENT SUBCLASS 303 / 129
.~.~.~ With speed governor (hydraulic or inertia)

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}
129.~.~.~ With speed governor (hydraulic or inertia) {1}
130  DF  .~.~.~.~> Compared to fixed reference

DEFINITION

Classification: 303/129

With speed governor (hydraulic or inertia):

(under subclass 128) Train speed control in which the velocity of the conveyance is regulated by a system using a pressurized liquid medium or by a system responsive to a change of motion.