US PATENT SUBCLASS 152 / 423
.~.~.~.~ Obstacle

Current as of: June, 1999
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152 /   HD   RESILIENT TIRES AND WHEELS

151  DF  TIRES, RESILIENT {14}
415  DF  .~ Inflating devices {5}
418  DF  .~.~ Wheel carried supply {1}
419  DF  .~.~.~ With positive pump operating means {3}
423.~.~.~.~ Obstacle {1}
424  DF  .~.~.~.~.~> Ground {1}

DEFINITION

Classification: 152/423

The pump operation involves contact of an element on the rotating wheel with an obstacle.