6. The Sardine Key Tin
Before easy-open cans became standard, sardines and other tinned foods came sealed with a key. This small metal key was attached to the can’s lid and used to roll back a strip of tin, peeling it open. It took a steady hand and some patience, and the sharp edges could be dangerous if you weren’t careful. These tins were popular throughout the 20th century and could be found in many kitchen cupboards. Some people even collected the keys or used them for small household tasks. Now, most canned goods come with pull tabs, making the old method seem complicated.
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