Abstract: The ergonomic computer keyboard is configured for use with a computer. The ergonomic computer keyboard is adapted for use with a person. The ergonomic computer keyboard is an interface device that enables a person to use the computer. The ergonomic computer keyboard comprises a housing and a key set. The key set is installed in the housing. The orientation of the key set is set such that the angle of attack of a finger to a key selected from the key set key is adjusted relative to a traditional computer keyboard. This adjusted orientation results in a more natural orientation of the hands to the key set relative to the traditional computer keyboard. The ordering of the indicia of each key in the key set is adjusted relative to the QWERTY ordering such that hand movements are minimized during the typing process.

Abstract: A yielding head for reducing the need to recondition a rock mass. The yielding head includes a mine hole cradle and a longitudinally movable bar therein. The bar, which is connected to an extension bolt, is registered with a collapsible bubble serrated yielding element circumscribing the bar. As the rock mass is displaced the bar is drawn into the mine hole. The yielding element absorbs the stress on the bar in a controlled manner.