US PATENT SUBCLASS 16 / 301
.~.~.~.~ Having tool-receiving aperture

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

221  DF  HINGE {32}
277  DF  .~ Resiliently biased hinge {10}
298  DF  .~.~ Having force adjustment {1}
299  DF  .~.~.~ Rotatable spring-engaging collar {2}
301.~.~.~.~ Having tool-receiving aperture

DEFINITION

Classification: 16/301

Having tool receiving aperture:

(under subclass 299) Hinge wherein the cylinder or annulus has formed therein an opening into which is engaged a tool to turn the cylinder or collar.