An apparatus for removing shingles and shingle fasteners from a roof. The influence of the other digital sub-circuit may, for example, be the introduction of ground bounce by switching of the other digital sub-circuit. The tubular portion has a formed slot along a longitudinal length of the tubular portion. The alpha-olefin polymer may comprise an interpolymer of ethylene and octene, while the ethylene-carboxylic acid copolymer may comprise ethylene-acrylic acid copolymer. The most-significant-bit counter decrements when the least-significant-bit counter has a zero-count state and provides an output signal when the least-significant-bit counter has a zero-count state.