A seat assembly for a vehicle includes a first seat back and a second seat back. The memory cells, for example, are ferroelectric memory cells. Moreover, since electrical energy is not wasted as thermal energy in the actuator driver, the problems of heat being generated in the driver and increased power consumption can be avoided. The drawbar hammer strap assembly also includes a handle member which is pivotally coupled to an upper end of the drawbar pin. It is useful as a dummy wafer in a plasma etching or deposition system.