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This is the birth of the cylinder musical box.
这就是滚筒音乐盒的诞生。
youdao
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Box section telescopic boom; Telescopic mechanism; Pinless boom; Single cylinder pin type;
箱型伸缩臂； 伸缩机构； 无销式；单缸插销式；
youdao
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Box section telescopic boom; Telescopic mechanism; Pinless boom; Single cylinder pin type;
箱型伸缩臂； 伸缩机构； 无销式；单缸插销式；
youdao