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A commercial ship is usually a link in a “trade route” between distant points. Goods flowing in the route must be transferred to and from the sea link; they must also be given care while aboard the ship, and in turn they must not be a hazard to the ship and its crew. Ancient cargo handling consisted almost exclusively of manually carrying cargo in single man-loads. For example, grain would be packed into sacks, each of a size that a man could carry on or off the ship on his shoulders. During the many centuries of dominance by sailing vessels, ...(100 of 22970 words)