US PATENT SUBCLASS 70 / 496
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Current as of: June, 1999
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70 /   HD   LOCKS

266  DF  OPERATING MECHANISM {6}
336  DF  .~ Key {10}
344  DF  .~.~ Single key {4}
348  DF  .~.~.~ Tumbler type {5}
357  DF  .~.~.~.~ Cylinder type {9}
490  DF  .~.~.~.~.~ Rotary plug {2}
491  DF  .~.~.~.~.~.~ Sliding tumblers {2}
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DEFINITION

Classification: 70/496

Including sidebar:

(under subclass 491) Device wherein structure, frequently in the nature of a shaft-like element, is included, and wherein the structure serves as an additional impediment to rotation of the plug relative to the cylinder by extending across, at one or more locations, the circular line of demarcation (i.e., the shear line) along which the plug turns relative to the cylinder.

(1) Note. See (2) Note of subclass 495 above, which Note is equally applicable here.