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King Saejong made a clock from the sun. It help his people work efficiently

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20417 김세윤-1433 made Jagyeongnu with Jang Young-sil

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20417 김세윤-1433 made Jagyeongnu with Jang Young-sil

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Jagyeongnu was made by Jang Young-sil. It is clepsydar. It made in 1433.

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1443 훈민정음
KIng Saejong made a 훈민정음 for the people. he made it alone.

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The rain gauge was made by King Sejong in August 1441.
was made to prevent damages from flood by measuring the exact amount of rain.

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Today, a number of people respect him. So he has been carved in Korea dollar.