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Heavy equipment refers to heavy-duty
vehicles, specially designed for executing construction tasks, most
frequently ones involving earthwork operations. They are also known as, "construction
equipment", construction plant, earth movers, engineering
vehicles, or simply equipment. They usually comprise five equipment
systems: implement, traction, structure, power train, control and
information. Heavy equipment functions through the mechanical advantage of
a simple machine, the ratio between input force applied and force exerted
is multiplied. Currently most equipment use hydraulic machinery as a primary source of transmission.