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A baffling bit of trivia. Canned food was invented in the late 18th century (1772) and was patented in the early 19th century (1810) and became common pretty quick (1820s). So far so good, but what is baffling is that the first can opener did not appear until around 1850-1860 (the one below is patented in 1855). So for 50+ years people were opening the darn things with whatever tools at hand, hammers, chisels etc.

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