US PATENT SUBCLASS 338 / 166
.~.~.~.~ With removable actuating shaft or key

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

68  DF  MECHANICALLY VARIABLE (E.G., RHEOSTAT) {24}
118  DF  .~ Movable contact electrically adjustable over length of resistance element {21}
160  DF  .~.~ Contact slides along in contact with element {3}
162  DF  .~.~.~ Contact angularly slidable {11}
166.~.~.~.~ With removable actuating shaft or key

DEFINITION

Classification: 338/166

(under subclass 162) Subject matter wherein the contact

actuating means or a portion thereof is readily separable from the resistor, such as a key or readily removable knob or shaft, as to prevent unauthorized adjustment of the resistor; or wherein structure is provided to permit ready adjustment by some actuator not ordinarily considered a part of the resistor such as a slot for the blade of a screw driver.

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers,

42+, for switches having means for preventing unauthorized use.