单词 | electric time-ball |
释义 | > as lemmaselectric time-ball ΚΠ 1859 T. P. Shaffner Telegr. Man. liii. 743 It was the electric time-ball, indicating the second, and the most minute division of time!. 1881 Science 7 May 210/1 (heading) The Kansas City electric time ball. < as lemmas |
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