Certificate

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  ISO 9001

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  CE-certificate

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  TUV-certificate

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  UL-certificate

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  SGS-certificate

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  Duct production line patent certificate

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  Plate bending machine patent certificate

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  Fire damper double blade patent certificate

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  Fire damper blade patent certificate

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  Lock former patent certificate

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  Smoke exhaust structure

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  Lifting lock former patent certificate

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  Vertical duct seam closing machine patent certificate

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  Vertical joint corner code machine patent certificate

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  Double folding lock former patent certificate

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  Column structure of lock former patent certificate

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  Roll positioning structure of lock former patent certificate

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  Roll positioning structure patent certificate