US PATENT SUBCLASS 16 / 21
.~.~ Ball

Current as of: June, 1999
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16 /   HD   MISCELLANEOUS HARDWARE

18 R  DF  CASTERS {20}
20  DF  .~ Antifrictionally swivelled {2}
21.~.~ Ball

DEFINITION

Classification: 16/21

(under subclass 20) Casters in which the casters antifrictional swiveling means comprises balls.