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I worked with someone who in 1970 bought what I am sure he called an ELSI-8 but it is not the one you show. He paid $400 for it (I remember that number well because in 1970, that was a lot of money). He was a licensed Land Surveyor so I guess it paid for him to buy it. Anyway, the calculator he had used an LED (red dots) display which were almost impossible to see on a bright sunny day and only had the ten number keys along with the plus, minus, multiply and divide keys... there way no decimal point key! This was a pure replacement for slide rules (which is what we used before) but it read out to 8 digits (could not get anywhere near that number of digits on a slide rule). Have you heard of such a calculator from back then? Could sharp have had an early model for its ELSI-8?