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Radioaktive Spuren in der Luft
The International System of Units (SI)
The Time
Hermann-von-Helmholtz
Exactly 125 years (Anniversary in 2012)
Evaluation
(PDF, 317 KB)
© Physikalisch-Technische Bundesanstalt, last update: 2012-05-15,
WEB-Redaktion
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,
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© Physikalisch-Technische Bundesanstalt, last update: 2012-05-15, WEB-Redaktion 
Printview, 
PDF
Press and Information Office
Evaluation