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File:Platinum-Iridium meter bar.jpg
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Found in articles
Fasciculus:Platinum-Iridium meter bar.jpg
English International prototype metre
bar
Fasciculus:US National Length Meter.JPG
the
Meter
had been signed in 1875, the BIPM in Sevres, France made 30 prototype standard
bars
of 90%
platinum
–10%
iridium
alloy. One of the
bars
was selected