ABACUS
Adair's new Encyclopedia · 1923 · p. 1
upper part of capital of a column, supporting architrave; also from Rom. times frame with beads running on wires, used for calculating.
Bu kavram başka kaynaklarda da geçiyor
The American Dictionary and Cyclopedia (1910)
Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
Chamber's Twientieth Century Dictionary (1908)
Nuttall Encyclopedia (1907)
Chandler's Encyclopedia (1898)
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