A relay finder optical system, of a single-lens reflex camera, includes a condenser lens group, a prism, and a relay lens group, in this order from a primary imaging plane. The self-test circuit is configured to inject into the micro-electromechanical structure a plurality of injected test signals that are broad-band frequency-varying frequency signals, which are based on spread spectrum based modulation. 95 or more; and a slice long chain branching index of 0. A hollow rotor hub is assembled to the base and extends through the hollow interior space. When the software of the operating system of the main computer terminal of the restaurant is programmed in to said device that provides wireless communication between the users and the kitchen of the restaurant while registering the orders with the main terminals. The method includes electrically interconnecting lead frame flanks associated with adjacent semiconductor devices before applying the coating of tin or tin alloy.