12th comparison between the Swedish National Kilogram and SP's principal kilogram mass standards.

• The 12th comparison between the Swedish National Platinum-Iridium kilogram (Proto¬type number 40) and the principal kilogram standards for mass has been performed at SP Swedish National Testing and Research Institute. The method used was a weighted least square method with restraint developed by Dr Leslie Pendrill < >. Weighings for the pan-European key intercomparisons for 1 kg, EUROMET 509 and 510 were made together with the regular kilogram comparison.

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