12-hour clock

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clock with Roman numerals

12-hour and 24-hour clocks

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12-hour clock: Media

time convention

Images

clock with Roman numerals

clock with Roman numerals

A 12-hour clock with Roman numerals.

JuergenG

Interactives

12-hour and 24-hour clocks

12-hour and 24-hour clocks

Interactive demonstrating the 12-hour and 24-hour clocks.

Encyclopædia Britannica, Inc./Rick Livingston

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