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pocket calculator is a calculator that we keep in our pocket
I saw the first modern electronic pocket calculator in 1967 when I was attending engineering school at the University of California in Berkeley. It was made by Hewlett-Packard.
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To use the karnaugh map for the casio e200, you would follow the instructions used in the download. For the free pocket map, you simply enter your specifications with the check boxes and the calculator would do the rest.
The E symbol means 'times ten to the power of'. So 4E7 means 4 x 107 which is 40,000,000.