US PATENT SUBCLASS 81 / 479
.~.~.~ With electric signal device


Current as of: June, 1999
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81 /   HD   TOOLS

52  DF  WRENCH, SCREWDRIVER, OR DRIVER THEREFOR {27}
467  DF  .~ Responsive to torque on work {7}
478  DF  .~.~ Work engaging portion pivotally or rotatably connected to handle {3}
479.~.~.~ With electric signal device


DEFINITION

Classification: 81/479

With electric signal device:

(under subclass 478) Wrench or screwdriver provided with an electrical device which is activated by the pivotal or rotational movement of the portion relative to the member and signals the operator when the selected torque is exceeded.

SEE OR SEARCH CLASS

116, Signals and Indicators, for mechanical signals, per se.

340, Communications: Electrical,

500+, for alarms which are automatically responsive to a condition. Note particularly indented subclasses 665 and 679+.