File:PSM V03 D420 Mechanism of indicator.jpg

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Description Mechanism of Indicator
Date between 1872 and 1873
date QS:P,+1872-00-00T00:00:00Z/8,P1319,+1872-00-00T00:00:00Z/9,P1326,+1873-00-00T00:00:00Z/9
Source Popular Science Monthly Volume 3
Author Unknown authorUnknown author
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