Abstract: A control panel includes a cover plate and at least one cap-shaped control key or button. The key includes a cap-shaped plastic substrate the side wall of which includes a light-block cylindrical portion for preventing light from leaking out through the side wall, even if the light-block coating formed on the outer surface of the side wall is not sufficient.

Abstract: An ornament set includes a plurality of ornament units having double-sided adhesive sheets adhered to the back thereof, and a retainer strip adhered to the front sides thereof to hold the ornament units in a predetermined relationship. A method for manufacturing the ornament set providing a plurality of ornament units respectively having front surfaces to be displayed and back surfaces to be attached to a body to be decorated, and providing an arranging tool having recesses formed therein in relative positions corresponding to relative positions in which the ornament units are to be attached to the body to be decorated. The ornament units are positioned in the recesses of the arranging tool, respectively, such that the front surfaces of the ornament units are respectively facing the bottoms of the recesses. A double-sided adhesive tape is adhered to the back surface of each of the ornament units, and a release strip is applied onto respective surfaces of the double-sided adhesive sheets.

Abstract: A synthetic resin vehicle wheel cover includes first and second mounting elements integrally formed with the cover. The first mounting elements include at least two cylindrical projections which project from the inner surface of the cover with the projections positioned along a circle about the center axis of the cover so that the projections are adapted to fit over and firmly grasp wheel fastening nuts. The second mounting means includes projections which project inwardly from the periphery of the cover so that the projections are adapted to fixedly engage with the tire receiving rim.

Abstract: A mirror comprising:a transparent plate of a synthetic resin;a surface-hardening layer (a) coated on an entire surface of the resin plate;a reflective metal layer (b) deposited on the layer (a) of the back of resin, anda back-coat layer (c) closely covering the surface of the reflective film, characterized in that said metal layer is formed by a dry metal plating, said metal being selected from the group consisting of tin or alloy of tin and copper (Sn:Cu=1:less than 0.4 by weight), thickness of layer (b) being in the range of 700-1600 .ANG. and moisture permeability of layer (a) being smaller than those of layer (b) and layer (c) is disclosed.

Abstract: The three dimensional display of the invention includes a display plate and a light source provided behind the plate. The display plate fundamentally includes a substrate made of a transparent material, an undercoating of transparent organic based color or colorless paint provided on the front surface of the plate, a light-reflective transparent metal coating on the undercoating, a transparent protective coating on the metal coating and a light-reflective surface provided on the rear surface of the substrate, the light reflective surface being opaque as a whole and including light-penetrable or transparent portions or vacant portions in the form of a predetermined image. To make the front surface of the display plate look like a roughened metal wall surface, the front surface of the substrate is roughened or the undercoating contains an agent which makes the front surface of the undercoating rough.

Abstract: A method for forming a metal layer with a positive pattern on a plastic sheet or plate substrate which comprises printing an oil-soluble, water-insoluble ink on the substrate to provide a negative pattern, forming a metal layer on said substrate by dry metal plating, immersing the substrate in a hydrocarbon having 6-17 carbon atoms, preferably kerosene, and removing the ink layer and metal layer thereon by applying supersonic vibration to the substrate in the kerosene.

Abstract: A printed circuit board is produced by forming a masking layer with a non-masking circuit pattern on the surface of a base plate by an ink which can be detached from the plate forming a metal layer on the plate with the masking layer by vacuum evaporation or sputtering, and then removing the ink of the masking layer and the metal provided thereon from the base plate, leaving the remaining metal as a circuit.

Abstract: This invention discloses an information display device including a front plate and information visualizing means provided behind the front plate and adapted to make information consisting of characters, patters and/or others appear on the front surface of the plate by the light emitted from the visualizing means and passing through the plate, the device being characterized in that the front plate is made from transparent material such as transparent synthetic resins, glass or the like and is provided with metal coating on the front surface or the back surface of the front plate. The thickness of the metal coating is such that the metal coating permits the light emitted from the visualizing means to pass through it to make the information emerge on the front surface of the front plate and substantially prevents light the intensity of which is less than the former light from passing through the coating.

Abstract: A water treating method is disclosed. Water stored in a container is circulated through an external passageway and subjected to ultraviolet radiation and biological oxidation treatment, whereupon the growth of undesired aquatic chlorophyceae and microorganisms is inhibited and at the same time, organic matter is decomposed and removed, thereby maintaining a low COD level and clarifying water in the container. This method is particularly useful for keeping water in a container clean.

Abstract: Water stored in a container is circulated through an external passageway and subjected to ultraviolet radiation, whereupon undesired aquatic chlorophyceae are eliminated by inhibiting their growth. The water is circulated at such a rate that at least half the volume of water in the container is circulated per hour.

Abstract: A water treating method is disclosed. Water stored in a container is circulated through an external passageway and subjected to ultraviolet radiation and biological oxidation treatment, whereupon the growth of undesired aquatic chlorophyceae and microorganisms is inhibited and at the same time, organic matter is decomposed and removed, thereby maintaining a low COD level and clarifying water in the container. This method is particularly useful for keeping water in a container clean.