Many modern can designs include a ring pull that allows the lid to be pulled off by hand instead of cut off with a can opener. What need might have led to such a design change?
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Well, opening cans with a ring makes it easier to open. Without them you would need to buy a can opener and risk cutting yourself while opening and drinking from a can. Overall it's just easier to take a few seconds to open a can rather then a minute or two to get a can opener and open it.
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