Sharp El-531v Scientific Calculator

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Sharp EL-531VB-BL Advanced D.A.L. Scientific Calculator (Blue)

Sharp EL-531X Advanced D.A.L Scientific Calculator w/ Cover. Green - Not Tested

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Vtg Sharp EL-531WH Advanced D.A.L Scientific Calculator (tested)

Sharp Advanced D.A.L. EL-531X Scientific Advanced Calculator Tested

Sharp EL-531XT Scientific Calculator Advanced D.A.L. Tested Working