The platinum and iridium alloy cylinder (pictured on November 16, Stock Photo, Picture And Rights Managed Image. Pic. CKP-P201811160652801 | agefotostock
Platin Iridium 800 - die hochwertigste Platin-Legierung
Platin Iridium 800 - die hochwertigste Platin-Legierung
Platinum-iridium kilogram killed off in favour of link to the Planck constant