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Delhi Iron Pillar. 7.21 m x 1.12 m dia Quwwat - ul -Islam mosque at Qutb complex 320 BC ?? Brought to Delhi in 1300s Hydrogen phosphate of iron.
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Delhi Iron Pillar • 7.21 m x 1.12 m dia • Quwwat-ul-Islam mosque at Qutb complex • 320 BC ?? • Brought to Delhi in 1300s • Hydrogen phosphate of iron