Light emitting diodes, semi-conductors, digital cameras, video cameras, photographic cameras, cinematographic cameras, video projectors, slide projectors, movie projectors, actinometers, illuminometers, hygrometers, pedometers, astronometric measuring machines and instruments, telephone apparatus, mobile telephones, video telephones, facsimile machines, television monitors, navigation apparatus for vehicles, namely on-board computers, satellite navigational system, namely, a global positionin...