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1. Introduction; 2. Present status of the kilogram; 2.1. Role of the kilogram in the SI; 2.2. Results of periodic verifications of national prototypes; 3. Counting atoms using ion accumulation; 4. Electromechanical methods; 4.1. The watt balance experiment; 4.2. Other electrical methods; 5. Possible new definitions of the kilogram and conclusions; 5.1. Definitions that fix the value of the Avogadro constant; 5.2. Definitions that fix the value of the Planck constant; 5.3. Planck and Avogadro constants; 5.4. A decision whose time will come
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