Dust cover and seal with double protection, isolated pollution.
采用防尘盖和密封圈双重保护，隔绝污染。
The cover layer on one side of basin has double structure.
盆地一侧的盖层具有双重结构。
The pot cover has applied double sealing.
锅盖采用双道密封。
Exhibits: Plastic Rings, Pvc Cover, Paper Cover, Double Wire.
展品：装订胶圈，装订胶片，皮纹纸，双铁圈。
Exhibits: Plastic Rings, Pvc Cover, Paper Cover, Double Wire.
展品：装订胶圈，装订胶片，皮纹纸，双铁圈。
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