The described system allows an operator to remotely switch between cutting and boring while removing solid carbonaceous residue from large cylindrical vessels called coke drums which typically utilize a cutting head for ejecting high pressure fluids into the coke bed; a flow diversion apparatus; and a shifting apparatus. The warning signal light provides various colored light signals for independent use or use by an emergency vehicle. The present invention also relates to coated substrates produced by the above methods. In one embodiment, the duty cycle detection circuit includes a self-bias circuit configured to generate a control signal according to the disparity between the corrected duty cycle and the target duty cycle. In one embodiment, the drill bit includes three roller cones. The sharps can include but are not limited to sharp medical instruments such as but not limited to syringes, needles, scalpel blades, as well as other sharp devices such as but not limited to sharp-tipped ornamental pins, sewing needles, and the like.