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IT was developed on the banks of the Indus and its tributaries around the northern and western part of Indian subcontinent
The  Neolithic or the new stone age was followed by the chalcolithic period During this period  people used tools made of copper metal along with stone tools. Gradually, people began mixing copper with tin or zinc and produced bronze. Bronze was harder and more ductile than copper. AS a result people started making tools and weapons of bronze
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