Bottle cap
A closure that seals the mouth of a glass bottle to keep its contents and carbonation in. The crimped crown cap that grips the bottle neck was devised in the 1890s and became the standard.
Bottle caps worldwide have 21 teeth.
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In Korea, only two companies can make soju bottle caps—not due to technical difficulty, but because the National Tax Service since 1972 restricts production to designated firms, cross-checking cap counts against liquor output to prevent tax evasion.
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