National standard double wall bellow
24/10/19 15:08:10
Executive standard for national standard double wall bellow,GB/T19472.1-2004 ring stiffness, ring flexibility, caliber, appearance size, impact, random inspection to ensure compliance!
24/10/19 15:08:10
Executive standard for national standard double wall bellow,GB/T19472.1-2004 ring stiffness, ring flexibility, caliber, appearance size, impact, random inspection to ensure compliance!
