Methods and systems for embodiments of a 9T memory cell, memory devices which utilize such 9T memory cells and the creation of embodiments of such memory devices are disclosed. The sealed flood light is capable of changing color by varying the intensity of each of the bulbs by regulating, independently, the electrical supply system of each of the bulbs, using a regulator, for example. The front ends of the links are connected respectively at two swing ends of the swing arms. The horizontal stagger virtually precludes a ball from impacting on both the plastic part and the metallic part simultaneously, and the thin profile of the metallic part causes deflection of a ball rather than rebound. The photomask blank can be accurately patterned without distortion to give a photomask.