Abstract: There is provided a system and method for representing complex databases having an arbitrary number of tables with a simple database comprising at least two tables, in which each attribute of each object is represented in a first table and in which each object is represented as a list of attributes in a second table. There is also provided a method for converting a complex database in a simple database.

Abstract: A reusable wall anchor device comprised of an upper and lower panel held together by a hinge connection for facilitating the suspending of articles from wallboards without requiring a hollow void behind the wallboard. A load bearing shank extends from the front face of the lower panel for supporting an object to be carried by the device. An arcuate prong and tine extend from the rear faces of the panels providing clamping and shear support for the device when they are inserted into the wallboard. The anchor assembly requires no tools other than the human hand during installation and removal and upon removal leaves minimal disruption to the wallboard.

Abstract: There is provided a system and method for representing complex databases having an arbitrary number of tables with a simple database comprising at least two tables, in which each attribute of each object is represented in a first table and in which each object is represented as a list of attributes in a second table. There is also provided a method for converting a complex database in a simple database.

Abstract: A shell for producing a temporary dental prosthesis such as a temporary dental crown includes an occlusal layer having an outer surface shaped to provide a tooth-like appearance; a buccal side connected to one edge of the occlusal layer and extending down therefrom; a lingual side connected to an opposite edge of the occlusal layer and extending down therefrom; and the shell being open along mesial and distal sides thereof.