Abstract: A tool for removing residues including a vibrating base and a number of cutters attached to the base. Each cutter includes a foot portion defining the lower portion of the cutter. The perimeter of the foot portion carries a cutting edge which contacts and removes residues from a work surface. The cutters are removably mounted on the base so that they can be interchanged with cutters including foot portions having perimeters of various geometric shapes. Further, the cutters are mounted on the base such that the inclination angle of the cutters can be adjusted with respect to the base. Changing the geometric shape and inclination angle of the cutters adjusts the abrasive action of the tool.

Abstract: A surveillance camera which automatically and continually varies both the lens angle and the aperture is provided. In an area under surveillance where conditions dictating a need for varying the exposure and the field of a surveillance camera, a continually reciprocating lens angle and a continually varying lens aperture, obtains a variety of camera settings which results in at least some satisfactory exposures of the area.