A removable scraper blade attachment for a toothed bucket of an earth working machine, such as a backhoe bucket, to allow the bucket to remove debris from a smooth surface such as a paved surface. Main power supply lines are arranged along one side of a rectangular region including a MOS logic circuit whose subthreshold current must be reduced, and a plurality of sub-power supply lines are arranged on the region in the direction perpendicular to the main power supply lines. The plurality of LED’s is positioned and substantially evenly distributed at the outer wall of the housing, and is connected through an electronic circuit to the pair of power supply wires. Trenches are then etched through the sacrificial stressed layer and into the SOI layer. In the second position, the first business operating in space A is in the basement, and the second business operating in space A\u2032 is at the street level. This compound is a potent drug for the treatment of hypertension while avoiding the concomitant liability of adverse effects associated with the racemic mixture of amlodipine.