ball signal
naturopathic therapy
(historical) A kind of mechanical signal used on early American railroads, consisting of wooden balls, painted various colors, that were hoisted up and down a pole using a rope and pulley.
A surname. / A township in Knox County, Nebraska, United States. / An unincorporated community in Brunswick County, Virginia, United States.
plural of artificial sweetener
歴史家は修復された木製の球形信号装置を指し示し、それが塗装された木球で機関士に接近する列車を知らせていた仕組みを説明した。
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