US PATENT SUBCLASS 152 / 3
.~.~ Spring enclosure

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

1  DF  SPRING WHEELS {3}
2  DF  .~ With lubrication {2}
3.~.~ Spring enclosure

DEFINITION

Classification: 152/3

The lubricant for the spring wheel is introduced into a closed chamber containing the springs.