The modern fork truck is the result of many different types of equipment and years of development and research, tracing its roots back over a hundred years to the two-wheel hand truck. Built with wrought iron axels and cast iron wheels, the two-wheel hand truck is a first-class lever and represents one of the earliest applications of the cantilever principle in materials handling equipment.
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Source: http://dailytipsforbusiness.blogspot.com/2012/02/industrial-mechanical_16.html
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