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This Radio Shack graphic scientific calculator is a dark-colored older unit which is powered by four CR2032 batteries and features a large display, plus memory backup.
The Radio Shack EC-4034 has F1-F6 buttons, arrow keys, and buttons for "Range", "EXE", and "EXP", among others. According to RadioShack, it offers a contrast adjustment, adjustable zooming of graphs, and a six-minute automatic shutoff function.
It was made in Japan and is also known as catalog number 65-804. The batteries are a common type and remain available from numerous sources. Unfortunately, they are not rechargeable.
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