Calculators
related: Abacuses
type: Concept

Counting frames
narrower: Abacuses
type: Concept

Abacuses
type: Concept
created: 2005-02-01T00:00:00.000Z
hidden label: Abaci
hidden label: Abacus
broader: Counting frames
related: Calculators
modified: 2011-03-31T00:00:00.000Z