Harts Mercantile Computing Machine (1878)

 

source: D.Amidon

 

 

 

 

 

source: D.Amidon

 

 

source: D.Amidon

 

 

source: D.Amidon

 

 

source: Thomas A. Russo

 

 

source: D.Amidon

 

 

 

 

 

           

 

 

 

last updated: 10-Mrz-11