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In page Dōtaku:

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Despite being a well-known artifact of the Yayoi era, the concept of dotaku did not initially originate in Japan. According to several studies, these bells are thought to be derived from "earlier, smaller Korean examples that adorned horses and other domesticated animals",[1] from Chinese cattle bells, or Han Chinese zhong, which were bells without clappers used for composing ritual music. However, further studies show that the Yayoi did not have cattle farms, and although several dotaku do have suspension rings and clappers, they make "muffled tones"[2] or "rattling sounds"[1] when struck, suggesting that they were not meant to be rung.[1] Therefore, any bells from China were imported as ritual objects.[2]