US PATENT SUBCLASS 280 / 428
.~.~.~.~ Interrelated brake and coupling

Current as of: June, 1999
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280 /   HD   LAND VEHICLES

29  DF  WHEELED {21}
400  DF  .~ Articulated vehicle {30}
423.1  DF  .~.~ Semitrailer {7}
427  DF  .~.~.~ Interrelated operation of coupling, landing gear, and brake {3}
428.~.~.~.~ Interrelated brake and coupling

DEFINITION

Classification: 280/428

(under subclass 427) Devices including interdependent operation of the trailer brakes and coupling mechanism.