A bias current circuit controls an oscillator that generates an oscillation signal of a frequency corresponding to an input current. The method of producing the bimetallic catalyst may include combining a Ziegler-Natta catalyst comprising a Group 4, 5 or 6 metal halide andor oxide, optionally including a magnesium compound, with a modifier compound, wherein the modifier compound is a Group 13 alkyl compound, to form a modified Ziegler-Natta catalyst. The first casing wall is formed with an opening portion communicated with the engaging groove portion. When a user pulls the handwear and outer glove inside-out, the inside-out handwear may contain and capture portions of the glove, which reduces exposure by the person to the previously outer surfaces of the glove. The ice agitator includes a hook and an arm that extends from the hook away from the center axis of the disk.