Commons Attribution-Share Alike 3.0 truetrue English The International Prototype Kilogram Persian نمونه بینالمللی کیلوگرم Wikimedia username: Japs 88 author...
DescriptionNational prototype kilogram K20 replica.jpg English: Replica of the national prototype kilogram standard no. K20 kept by the US government National...
DescriptionMassStandards 024.jpg Bell jar display of prototype kilogram replica Source National Institute of Standards and Technology Author National Institute...
