^As early as 225 BC, chain was used to draw a bucket of water up from a well. This very early bucket chain was composed of connected metal rings.Tsubakimoto Chain Co. (编). The Complete Guide to Chain. Kogyo Chosaki Publishing Co., Ltd. 1997: 240 [17 May 2006]. ISBN 0-9658932-0-0. p. 211. (原始内容存档于2018-09-02).