Start to development of production technology of metal forging steel types can be human. Tools. And start to flourish to such an extent as the engine, the use of force instead of people. Force animals up to flourish.
Initial development of the production technology of metal that can melt metal to the steel making tools were available to the flourishing substandard engine is used to represent the people, the animals developed until now.
The development started working in production technology of metal man can forge steel type up making tools, and Start the engine to a prosperous mechanism used instead of manual force animals thrive along until the present.