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While this 1968 handheld device may not have a maps app on it, the design is slick and for the right person must have been a very useful tool to have.
I’ve always loved these types of computing devices the color wheel is another simple example of this kind of device. I imagine designing my own would be a rather fun activity, perhaps I could make one that lets teaches people how to be more polite or a device that shows you how to quickly calculate distances and heights perhaps a device that shows you what foods go together well for meals.