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الساعات الذرية Atomic Clocks

تعتبر الساعات الذرية Atomic Clocks من أحدث وأكثر أجهزة ضبط الوقت دقةً، وقد توصل إلى مبدأ عملها بروفيسور الفيزياء (إيزادور رابي) من جامعة كولومبيا في عام 1945.