Abstract: A fingertip protective cover to reduce transmission of germs, viruses and the like when a person’s fingertip contacts a touchscreen, such as are used on many electronic devices. A dome shaped main body has a convex top surface, adapted for contact with touchscreen contact points. A bottom surface has a concave recess for receiving a portion of a human fingertip. At least the recess of the fingertip protective cover is sufficiently self-adhesive to releasably adhere to the fingertip in use, or alternatively an adhesive is disposed in the recess. The top surface is electrically conductive to permit use with electrically conductive (capacitive) touchscreens. The entirety of the fingertip protective cover may be formed of an electrically conductive material, or alternatively the top surface may be covered with a layer of electrically conductive material.

Abstract: A roller reamer for downhole operations in boreholes, such as are drilled for oil and/or natural gas production, or as injection wells. An elongated main body has preferably three circumferentially spaced pockets. A roller assembly is preferably disposed in each pockets, the roller rotating in roller blocks at each end of the roller disposed within the roller blocks. Mating locking profiles, such as dovetails, lock the roller blocks within the pockets, as the roller blocks are moved longitudinally into the locking profiles, preventing any radially outward movement of the roller assembly. The roller assembly is prevented from longitudinal movement within the pockets by lock blocks also positioned within the pockets.

Abstract: A roller reamer for downhole operations in boreholes, such as are drilled for oil and/or natural gas production, or as injection wells. An elongated main body has preferably three circumferentially spaced pockets. A roller assembly is preferably disposed in each pockets, the roller rotating in roller blocks at each end of the roller disposed within the roller blocks. Mating locking profiles, such as dovetails, lock the roller blocks within the pockets, as the roller blocks are moved longitudinally into the locking profiles, preventing any radially outward movement of the roller assembly. The roller assembly is prevented from longitudinal movement within the pockets by lock blocks also positioned within the pockets.