US PATENT SUBCLASS 303 / DIG 4
.~.~ Pressure signal used in electrical speed controlled braking circuit

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303 /   HD   FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS

DIG 2  DD  Brake control by pressure comparison {1}
DIG 3  DD  .~ Electrical pressure sensor {1}
DIG 4.~.~ Pressure signal used in electrical speed controlled braking circuit