US PATENT SUBCLASS 180 / 249
.~.~ And means for locking out the differential means

Current as of: June, 1999
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180 /   HD   MOTOR VEHICLES

233  DF  HAVING FOUR WHEELS DRIVEN {7}
248  DF  .~ With differential means for driving two wheel sets at dissimilar speeds {1}
249.~.~ And means for locking out the differential means {1}
250  DF  .~.~.~> Manually operated type of lockout means

DEFINITION

Classification: 180/249

And means for locking out the differential means:

(under subclass 248) Vehicle provided with additional means for preventing the differential means from causing the wheel sets to be driven at speeds which are not the same.