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TI-1200 Calculator Family – Less Common Versions
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Datamath 2500 Version 1
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Texas Instruments TI-2550-II
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Texas Instruments SR-51A
The SR-51A is the next step after the short lived SR-51 calculator and it was the high-end calculator in the Texas Instrument line in 1975 together with the lower prices SR-16 and SR-50A. The SR-51A has the same functionality as the SR-51.