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maintenance + preform holder upgradeMachine：SFL6/4 Maintance date：2020.4 Scope ：Maintance + Preform holder upgrade Purpose ：Seal leakage + Part of the equipment has a bad preform holder, which affects normal operation.
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maintenance + preform holder upgradeMachine：SFL6/4 Maintance date：2020.4 Scope ：Maintance + Preform holder upgrade Purpose ：Seal leakage + Part of the equipment has a bad preform holder, which affects normal operation.
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