diaphragm packing ring
迷宫式隔板汽封环
Wooden jewelry box for earring, finger ring packing.
木制首饰盒耳环, 戒指包装。
Each packing ring individually inserted and compressed for better tightness.
每个垫圈都分别穿入并经过压紧以提供更好得紧固性。
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