Category:Adding machine by Johann Helfrich von Müller

Media in category "Adding machine by Johann Helfrich von Müller"

The following 3 files are in this category, out of 3 total.

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  Calculator by Johann Helfrich von Müller, view 1, 1784, wood, brass, steel, leather - Hessisches Landesmuseum Darmstadt - Darmstadt, Germany - DSC00575.jpg 4,100 × 3,399; 7.06 MB
  
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  Calculator by Johann Helfrich von Müller, view 2, 1784, wood, brass, steel, leather - Hessisches Landesmuseum Darmstadt - Darmstadt, Germany - DSC00581.jpg 3,705 × 3,288; 6.69 MB
  
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  Detail der Rechenmaschine von Johann Helfrich Müller.jpg 1,288 × 966; 246 KB