Abstract: The present disclosure generally relates to cellular-based communication between operator control units (OCUs) and machine control units (MCUs), such as a locomotive control unit and other industrial machine control units.

Abstract: The present invention concern a method for increasing bone density in a patient in need thereof which comprises the step of cutting the bones of said patient with a piezo ultrasonic surgical knife using a ultrasonic frequency of between 28 000 and 36 000 Hz.

Abstract: A snow grooming apparatus is adapted for being drawn by a towing vehicle on a snow surface such as a ski slope. A chassis rides on a pair of runners and supports plural snow shearing blades which are angled for directing snow laterally with respect to the center of the apparatus. An hydraulic actuating system is adapted for vertically positioning a ski centered with respect to the runners. Thus, when this ski is extended downwardly, the chassis and the snow shearing blades are raised to accommodate the snow surface. A pair of wheels are movable to support the chassis above the surface for moving across roads.

Abstract: A snow grooming apparatus is adapted for being drawn by a towing vehicle on a snow surface such as a ski slope. A drawing yolk engages the towing vehicle and pivots on a main chassis of the apparatus. The main chassis rides on a pair of spaced apart runners and supports plural snow shearing blades which are angled for directing snow laterally with respect to the center of the apparatus. An hydraulic actuating system is adapted for vertically positioning a ski centered with respect to the runners and forward of the center of mass of the main chassis. Thus, when this ski is extended downwardly, the main chassis and the snow shearing blades are raised. A pair of wheels of a secondary chassis are movable such that the main chassis may be supported above a snow or road surface between the pair of wheels and the hitching means. Alternately, the pair of wheels may be drawn up, above the surface with the main chassis supported on its runners when the ski is raised.