Abstract: A sign that has rotating elements that present various faces to viewers, is driven by a motor that will rotate the sign elements. The motor is controlled so that the operating current of the motor in a normal operating cycle is sensed, and a reversing set point circuit limit is adjusted as a function of the current sensed to provide for a changeable set point limit that is related to the operating current needed up to a maximum current level.

Abstract: A tamper-resistant display holder is responsive to the selective application of an external magnetic field. The display holder includes at least one frame section having an elongated front member and an elongated back member which are adapted to be interconnected to one another in a pivotal relationship for holding a display piece. The display holder further includes a magnetically attractable locking tab having first and second opposite ends. The first end is pivotally attached to the front member such that the second end is movable between a locked position and an unlocked position relative to the back member in response to the external magnetic field.