Dong ho thach anh
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<timefyi-glossary slug="quartz-clock"></timefyi-glossary>Định nghĩa
Dong ho su dung dao dong cua tinh the thach anh (32.768 Hz) lam phan tu giu thoi gian. Duoc phat minh nam 1927, dong ho thach anh chinh xac den vai giay moi thang.