US PATENT SUBCLASS 81 / 55
.~.~ Bolt-holding

Current as of: June, 1999
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81 /   HD   TOOLS

52  DF  WRENCH, SCREWDRIVER, OR DRIVER THEREFOR {27}
54  DF  .~ Machine {10}
55.~.~ Bolt-holding {1}
56  DF  .~.~.~> Gear-operated

DEFINITION

Classification: 81/55

The wrench or screwdriver has a device or part which prevents the movement of the bolt while the nut is being turned on or off.

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13,

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29, Metal Working,

240+, for means assembling parts by relative rotation.