Abstract: An inductor includes a coil including a winding section and extended sections, a body containing the coil and having a bottom surface and end surfaces adjacent to the bottom surface and opposed to each other, and outer electrodes on at least the bottom surface and connected to the extended sections. The winding-axis direction of the coil intersects with the bottom surface. The conductor has a cross section with a rectangular shape defined by thickness and width and has first surfaces defined by its extending direction and the thickness direction and second surfaces defined by the extending direction and the width direction. The winding section is spirally wound such that the second surfaces are on an outer side and on an inner side, respectively, and is wound in two tiers connected in their innermost locations, and both ends are in outermost locations in the tiers, respectively.

Abstract: An agent for dissolving dental calculus and/or dental caries, which comprises one or more kinds of substances selected from the group consisting of inositol phosphoric acid esters (e.g., phytic acid), polyphenols (e.g., Perilla frutescen var. crispa polyphenols), phosphoric acids, edetic acid salts, tartaric acid, malic acid, citric acid, and glycolic acid as an active ingredient. Dental calculus and/or dental caries can be conveniently dissolved in a short period of time.

Abstract: An agent for dissolving dental calculus and/or dental caries, which comprises one or more kinds of substances selected from the group consisting of inositol phosphoric acid esters (e.g., phytic acid), polyphenols (e.g., Perilla frutescen var. crispa polyphenols), phosphoric acids, edetic acid salts, tartaric acid, malic acid, citric acid, and glycolic acid as an active ingredient. Dental calculus and/or dental caries can be conveniently dissolved in a short period of time.

Abstract: An overload preventive device is capable of preventing elevation of preload pressure due to sticking action or break-through load of a hydraulic cylinder of a press machine. A delay valve for opening when the internal pressure of the load detecting circuit is lower than the minimum pressure to be maintained continuously over a specified time is interposed between a hydraulic pump for supplying pressurized oil of a specified pressure to a load detecting circuit.