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Tektronix 31 Desktop Calculator
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Another beautiful vintage desktop calculator: Monroe 325 Scientist. This is a programmable desktop calculator, it has a printer included and it also has a cassette interface which allows connection to a Monroe 392 tape recorder.
The Wang 450 desktop calculator is one of the last large calculators made by Wang. The 400 family was the last series of calculators made by Wang and the 450 Scientific is one of the series.