Notes
1Images and historical data of this device are available at http://www.vintagecalculators.com/TISR51A_1.jpg and http://www.datamath.org/Sci/WEDGE/sr-51a.htm
1Images and historical data of this device are available at http://www.vintagecalculators.com/TISR51A_1.jpg and http://www.datamath.org/Sci/WEDGE/sr-51a.htm
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