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→[[4th millennium BC]]: Added dental surgery. Modified Bronze. |
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* [[4000 BC]]: [[Cotton]] in [[Mehrgarh]] ([[History of India|India]]/[[History of Pakistan|Pakistan]])
* [[39th century BC|3800s BC]]: [[Sweet Track|Engineered roadway]] in [[England]]
* [[Bronze]] in [[Mesopotamia]], [[Susa]], [[Luristan]] and the [[Maikop culture]]
* [[3500 BC]]: [[Plywood]] in [[History of ancient Egypt|Egypt]]
* 3500 BC: [[Cuneiform script|Writing]] in [[Sumer]]
* 3500 BC: [[Carts]] in [[Sumer]]
* [[3100 BC]]: [[Drainage]] in the [[Indus Valley Civilization]] ([[History of India|India]]/[[History of Pakistan|Pakistan]])
* [[Dental surgery]] in [[Mehrgarh]] ([[Indus Valley Civilization]])
* [[Silk]] in [[History of China|China]]
* [[Cement]] in [[History of ancient Egypt|Egypt]]
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