Abstract: A device is provided for a user to self-diagnose areas of the human body when those areas are treated with a disclosing material which is invisible to the naked eye, but which fluoresces when subjected to appropriately filtered light. In particular the device provides mirror and light-filtering portions such that the user may diagnose areas of his or her oral cavity when treated with and differentiated by the disclosing fluorescent material.

Abstract: A concentric, valveless internal combustion engine is provided, consisting essentially of a rotary piston which revolves in a casing about a central shaft. The rotary piston contains combustion cavities distributed equidistantly around its perimetral wall surface. The casing contains combustion chambers and adjoining exhaust ports, and fuel intake manifolds in spaced relationship from one another. One or more means for igniting the fuel mixture is/are distributed at spaced intervals which are designed to provide timed ignitions of the fuel mixtures. Means are provided for starting the engine's rotation, and for feeding it a fuel-air mixture. As the piston rotates it carries the fuel mixture from the intakes to the points of fuel ignition, then to combustion chambers where the ignited fuel gases expand rapidly, and next to ports where the gases are exhausted from the engine.