Social learning theory of aggression.

The present invention is an earth boring device and more particularly a device for expanding a portion of a drilled hole to a greater diameter. The device of the present invention includes a body portion adapted to be attached to the end of, or inserted into, a drill string. A plurality of cutter blades are pivotally mounted upon and circumferentially spaced about the body. Fluid circulation means are provided to supply fluid outwardly along the cutting length of each blade. A mandrel is carried within the body in engagement with a lever arm portion of each blade whereby longitudinal movement of the mandrel pivots each blade from a closed to an opened position. In order to center the drill string in the non-expanded portion of the bore hole, a bearing guide means is provided on the drill string proximate to the expanding apparatus.

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