Abstract: A soil spreading scraper device comprises a cutting blade for cutting a top layer of soil from the ground, a kicker for throwing the cut soil rearward from the cutting blade, and an impeller member rotatable within a plane of rotation extending upward and rearward from the cutting blade for capturing the soil thrown by the kicker and spreading the cut soil generally radially outward relative to an axis of rotation of the impeller.

Abstract: A soil spreading scraper device comprises a cutting blade for cutting a top layer of soil from the ground, a kicker for throwing the cut soil rearward from the cutting blade, and an impeller member rotatable within a plane of rotation extending upward and rearward from the cutting blade for capturing the soil thrown by the kicker and spreading the cut soil generally radially outward relative to an axis of rotation of the impeller.

Abstract: An improved display screen flicker detection and correction system. The system includes a flicker detection component. A test pattern is placed on a display screen to be tested and corrected. The flicker detection component is placed on or near the display screen. The flicker detection component senses the change in light level that results from the flickering screen. The display system is then adjusted to minimize flicker.

Abstract: An improved display screen flicker detection and correction system. The system includes a flicker detection component. A test pattern is placed on a display screen to be tested and corrected. The flicker detection component is placed on or near the display screen. The flicker detection component senses the change in light level that results from the flickering screen. The display system is then adjusted to minimize flicker.

Abstract: An improved display screen flicker detection and correction system. The system includes a flicker detection component. A test pattern is placed on a display screen to be tested and corrected. The flicker detection component is placed on or near the display screen. The flicker detection component senses the change in light level that results from the flickering screen. The display system is then adjusted to minimize flicker.

Abstract: A prime mover for transforming energy from the pressure form to the mechanical form. The prime mover comprises a pair of toothed rotors which engage one another so as to be self-timing. Each rotor has a first portion of relatively large diameter and a second portion of relatively small diameter, each of the portions extending approximately 180.degree.. The rotors are enclosed in respective intersecting cylindrical chambers in a housing, with the tips of the teeth of the small diameter portion of each rotor being displaced radially inwardly from the peripheral surface of the corresponding chamber, and with the tips of the teeth of the large diameter portion of each rotor being directly adjacent to the inner surface of the corresponding chamber. First and second sealing members are mounted in the housing, and these engage the tips of successively passing teeth of the large diameter portion of each rotor, as the rotors turn.