Tag: ec-4019

Radio Shack EC-4019 Calculator Problem and Solution

The Radio Shack EC-4019 is a great calculator. I have had it since the late 1980s since it was new. It has worked flawlessly up until about 2012, when a new battery was needed. Yup, it took over 20 years to finally have the need to replace the battery. Not to suggest that it is being used on a daily…

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