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  • It was a principal weapon through the 15th century ad and was ousted then only by gunpowder.Neolithic toolsThe Neolithic Period, or New Stone Age, the age of the ground tool, is defined by the advent around 7000 bc of ground and polished celts (ax and adz heads) as well as similarly treated chisels and gouges, often made of such stones as jadeite, diorite, or schist, all harder than flint.
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