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Pavillon de Breteuil

Pavillon de Breteuil is a building located in Saint-Cloud,[1] France near Paris. It was inaugurated by Louis XIV in 1672. It is in the park of the former royal Château de Saint-Cloud, which was destroyed in 1870.

The Pavillon du Mail became known as the Pavillon de Breteuil in 1785. The building had been used since 1875 by the International Bureau of Weights and Measures (French: Bureau international des poids et mesures). Following an agreement signed on 25 April 1969 between the International Committee for Weights and Measures (French: Comité international des poids et mesures) (CIPM) and the French government, contrary to popular belief, the Pavilion de Breteuil does not enjoy extraterritoriality but only partial immunity.[2][3]

It is the home of the International Prototype of the Kilogram, which lost its status as a standard on 20 May 2019.

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Coordinates: 48°49′45.55″N 2°13′12.64″E / 48.8293194°N 2.2201778°E / 48.8293194; 2.2201778