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CHM002b
CHM003
CHM004
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CHM006
  CHM007.JPG - A Corean abacus with only 1 "heaven" bead (upper row). Also in the Computarium collection. There were similar abaci in use in Japan prior to 1900.  
CHM008
CHM009
CHM010
CHM011
CHM012

A Corean abacus with only 1 "heaven" bead (upper row). Also in the Computarium collection. There were similar abaci in use in Japan prior to 1900. Download
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