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Diskussion:Indikatorplanimeter Unbekannt
This planimeter is identical to Amsler Model 6
[1].
Considering that Amsler Planimeters was unsigned until 1914 circa, up to serial numbers 50000-60000 circa, we could say that this an earlier Amsler Original Planimeter Celli 14:01, 7. Feb 2013 (CET)