It has to do with the types of metals that were available to make tools. Bronze is made from tin and copper. These metals smelt at a lower temperature than iron and so were available with more primitive technology. In order to smelt iron, which is a harder metal, they had to invent the bellows in order to get the fire hot enough to melt the iron. When iron was introduced, it was a much superior metal and was actually considered a precious metal.

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