Abstract: A viewer discretion television program control system including devices and methods for controlling access to television viewing, especially by children. It includes provision for storing suitability ratings for each program receivable by a television set, allocation of personal identification numbers to each of a plurality of potential viewers (e.g., children), and individual allocations of permissible viewing time and program content, all under the control of a local authority such as a parent or guardian.

Abstract: A door/window construction in which a unitary sheet of light transmissive material such as transparent or translucent glass or plastic is covered with masking material and provided with a plurality of small holes spaced apart at predetermined intervals. Fasteners are inserted in the holes and project outwardly to engage corresponding recesses in muntins that are thereby positioned and fastened on the sheet so as to give the appearance of a multi-panelled door/window. Fastening staples are provided to hold exposed portions of the muntins in place when stiles and rails of the doors/windows are attached. Also included is the method of manufacture and assembly of the doors/windows.

Abstract: A fail safe power supply system specially adapted for supplying power to devices such as lights. A battery is provided to supply power to the devices, and during normal operation, charge on the battery is maintained within selected levels by a charging control system that is connected to a source of commercial power. During a commercial power outage, the battery continues to supply normal power to the devices for a prolonged period of time, usually until commercial power is restored, thus obviating the necessity for a separate backup power source.

Abstract: A sensing cable element including a non-uniform cable which is configured so as to substantially vary along its length in its ability to detect mechanical disturbances.

Abstract: An improved mechanical donut and donut assembly in which donuts made of plastic materials are formed in segments that facilitate installation, removal and/or replacement for manufacture and maintenance. The donuts of the preferred embodiments are made of urethanes, especially polyurethane, while fastening members such as threaded bolts are made of nylon. The relative characteristics of the urethanes and nylon are such as to facilitate a self-tapping feature for the nylon bolt.