File:Platinum-Iridium meter bar.jpg - Wikimedia Commons
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The International Bureau of Weights and Measures (BIPM) at Sèvres made 31 prototype line standards of platinum - 10 percent iridium alloy. These have Stock Photo - Alamy
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File:US National Length Meter.JPG - Wikimedia Commons
National Bureau of Standards Replica Meter Standard | National Museum of American History
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To Promote DIY Metric Rulers in the 18th Century, Paris Placed Meter-Long Marble Blocks on Public Buildings - Core77
