Abstract: A centralizer for use in a rock drill rig is disclosed. The centralizer includes a clamping member which moves generally tangentially to a bush, in order to clamp the bush in place within the centralizer.

Abstract: A centraliser for use in a rock drill rig is disclosed. The centraliser includes a clamping member which moves generally tangentially to a bush, in order to clamp the bush in place within the centraliser.

Abstract: A thin lightweight booklet and method of making the same are disclosed. The booklet is comprised of one elongated sheet folded in thirds, then in half, then in half to define pages of the same size without the use of fasteners. The sheet is folded so as to have a fold line between and adjacent the free ends of said sheet at one end of the booklet and only a fold line at the other end of said booklet. The booklet is adapted to be sealed within an envelope.

Abstract: A thin lightweight strip of booklets and method of making the same are disclosed. The booklets are comprised of one elongated sheet folded in thirds, then in half, then in half to define pages of the same size without the use of fasteners. The booklets are connected end to end to form a strip which is separable along perforation lines. The strip of booklets has a fold line between and adjacent the free ends of said sheet along one edge of said strip and only fold lines along the opposite edge of said strip. The strip of booklets is adapted to be sealed within an envelope.