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It is necessary to select materials, a type, a size and a configuration to carry loads in a safe and serviceable fashion. The architects and engineers mobilize the resources needed to realize the final structure. This classical approach is used to build. In general, structural design implies engineering of stationary objects such as buildings and bridges, objects that may be mobile but have a rigid shape such as ship hulls and aircraft frames. But it is an area of mechanical design, to which devices are generally assigned. These are devices with parts planned to move with relation to each other.