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In the International System of Units (SI), the only prototype remaining in current use is the International Prototype Kilogram, a solid platinum-iridium cylinder kept at the Bureau International des Poids et Mesures (International Bureau of Weights and Measures) in Sèvres France (a suburb of Paris) that by definition is the mass of exactly one kilogram.
This was the reason why in 1889 by the 1st General Conference on Weights and Measures (CGPM) of the Bureau International des Poids et Mesures (BIPM) the three characteristics length, mass, and time were selected and in 1954 during the 10th CGPM three more characteristics were added and it was decided to derive an International System of Units (SI) that should cover all physical characteristics.
The prototypes and working copies were deposited at the International Bureau of Weights and Measures (Bureau international des poids et mesures), Sèvres, France.
On 9 April 1959, Meissner sailed from New York City for Europe to visit his sister and niece, visit the Bureau International des Poids et Mesures (International Bureau of Weights and Measures), teach in the summer semester at the Christian-Albrechts University of Kiel, and attend an interferometry conference in London.
The Metre Convention (Convention du Mètre) of 1875 mandated the establishment of a permanent International Bureau of Weights and Measures (BIPM: Bureau International des Poids et Mesures) to be located in Sèvres, France.
The measurement of time is overseen by BIPM (Bureau International des Poids et Mesures), located in Sèvres, France, which ensures uniformity of measurements and their traceability to the International System of Units (SI) worldwide.