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Open Access Standard Kilogram Weights

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The original metric standard of weight adopted in 1799 was a kilogram fabricated from platinum. The presentinternational standard kilogram was made nearly a century ago from 10 per cent iridium-platinum. Johnson Matthey was deeply concerned with this work and since then has regularly supplied further national prototypes and working standards toastrict specification.
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Document Type: Research Article

Publication date: April 1, 1973

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