Abstract: An image display device includes a case having an opening, a luminous source image display displaying a first image, a focusing element receiving light from the source image display and focusing the light to form a second image that is viewable through the opening of the case, and an image source providing image information to the source image display so that the source image display displays the first image. The focusing element has a concave mirror and a mirror supporter that supports the concave mirror. The perimeter of the concave mirror has at least one straight- cut portion that has a line contact with the mirror supporter. The image information provided by the image source is changed with user interaction.

Abstract: The failure rate of the mounting structure for mounting the induction coil modules in an induction furnace is reduced by replacing the normal rigid supporting rods used to secure the induction coil modules to the furnace housing or frame with flexible mounting members. The flexible mounting members include a length of flexible material such as steel cable. Apparatus, such as a threaded rod, for securing the mounting member to the furnace housing is secured, as by swedging, to one end of the flexible material. Apparatus, such as a clevis, for securing the mounting member to the induction coil module is secured, as by swedging, to the other end of the flexible material.

Abstract: A fluid tight structure or vault particularly suited to having hazardous liquid storage tanks located therein for storage of liquids such as gasoline, and used as a replacement for underground storage tanks in facilities such as gasoline stations, truck stops, or industrial plants, so that the storage tanks are available for periodic inspection and any leakage from such tanks is contained within the structure to avoid contaminating surrounding ground, is constructed of prefabricated concrete panels having weldable material embedded therein where the panels meet so that the panels may be seal welded together along adjacent edges to provide the fluid tight structure. Thus, floor panels have plates of weldable material embedded therein over which wall panels having bottom edges of weldable material are placed and welded. Adjacent side edges of the wall panels are also welded. The welds provide seals between the various panels and provides structural strength to hold the panels in assembled position.