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The can opener was invented nearly 50 years after the can itself, initially requiring tools like hammers and chisels for opening. The can was developed in 1795 under Napoleon's initiative, with the first metal can patented by Peter Durand. Early cans were too thick for simple tools, leading to the use of improvised methods. The first true can opener was patented by Ezra J. Warner in 1858, featuring a blade for cutting the lid. Although not widely popular initially, it gained traction during the Civil War. Subsequent improvements led to the modern can opener design, established in the 1920s by Charles Arthur Bunker.