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Titanium Discovered - William Gregor
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Titanium Isolated to 95% Purity - Lars Fredrik Nilson and Sven-Otto Pettersson
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Titanium Isolated to 98% Purity - Henri Moissan (Date Unknown)
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99.9% Pure Metallic Titanium Produced - Matthew A. Hunter
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Perfectly Pure Titanium Produced - van Arkel and de Boer