US PATENT SUBCLASS 280 / 169
.~.~.~ Treads

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

29  DF  WHEELED {21}
727  DF  .~ Attachment {22}
163  DF  .~.~ Steps {4}
169.~.~.~ Treads

DEFINITION

Classification: 280/169

(under subclass 163) Devices relating to foot-engaging portion of the step.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings),

177+, for a wear or friction carrying surface of more general utility.