Image: Detail der Rechenmaschine von Johann Helfrich Müller
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Description: Detail der Rechenmaschine von Johann Helfrich Müller
Title: Detail der Rechenmaschine von Johann Helfrich Müller
Credit: Stahlkochers collection
Author: Nick Stahlkocher
Permission: GFDL
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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