"The keyboard equipment of vertical piano includes keyboard, mechanical system, casing system, descending system, back hollow system and top door system.
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casing collection system 套管气收集系统
mud line casing support system 泥线套管支承系统
casing feed system 套肠衣系统
casing stuffing and clipping system 肠衣充填及剪切系统
double casing pipes system 双套管系统
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