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clock signal▼◼◼◼noun[UK: ˈklɒk ˈsɪɡ.nəl] [US: ˈklɑːk ˈsɪɡ.nəl]
clock pulse▼◼◻◻noun[UK: ˈklɒk pʌls] [US: ˈklɑːk ˈpəls]
time-ball▼noun[UK: ˈtaɪm bɔːl] [US: ˈtaɪm ˈbɒl]
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