Abstract: A power center for using ON-OFF switches to control power availability for individual receptacle outlets is disclosed. The molded-in receptacle apertures and podded contact strips provide significant space, cost and efficiency improvements over existing power centers which use stand-alone, off-the shelve receptacle parts.

Abstract: Selecting different sectors in a storage medium using switches on the storage medium, instead of programming the instrument reading the storage medium. Each switch has a switching material. The switching material can be located at more than one interchangeable position. The position determines the priority of its corresponding sector as compared to other sectors. The location of the switching material is determined electronically. Switching materials suitable for the present invention include a reflective material, an opaque material, a reflective concave material, a convex lens, a prism, a set of lines, a magnetic material and a flexible reflective membrane.