Certificat

• 

  ISO 9001

• 

  CE-certificate

• 

  TUV-certificate

• 

  UL-certificate

• 

  SGS-certificate

• 

  Duct production line patent certificate

• 

  Plate bending machine patent certificate

• 

  Fire damper double blade patent certificate

• 

  Fire damper blade patent certificate

• 

  Lock former patent certificate

• 

  Smoke exhaust structure

• 

  Lifting lock former patent certificate

• 

  Vertical duct seam closing machine patent certificate

• 

  Vertical joint corner code machine patent certificate

• 

  Double folding lock former patent certificate

• 

  Column structure of lock former patent certificate

• 

  Roll positioning structure of lock former patent certificate

• 

  Roll positioning structure patent certificate