The present invention is an engine, which includes a positive displacement compression process, a variably fueled, continuous combustor andor heat exchanger, and a positive displacement, work-producing expander. The thickness of the substrate is changed from a first thickness, which gives rigidity to the substrate to the second thickness, which gives flexibility to the substrate. A comparison device provides a comparison result indicative of a comparison between the analog input and the analog bit-weighting signal and stores the result in a third register. Methods of utilizing the discharge devise as a gas discharge light source for producing ultapure water. Using the oral care tool, a user performs oral care and interacts with an electronic andor video game the base unit implements and runs. The seamless belt has a bending durability of 100,000 or more times in a specific bending test and has a Vickers hardness of 450 or more.