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A fixed ball valve ball with good sealing performance - utility model patent
Floating ball valve ball production equipment-utility model patent
A corrosion-resistant sphere with handle - utility model patent
A valve seat for fixing a ball valve - utility model patent
A stainless steel ball production and grinding equipment-utility model patent
For L-type three-way ball valve ball - utility model patent
Polishing device for stainless steel sphere production - utility model patent
Device for transporting stainless steel spheres - utility model patent
Valve seat for T-type three-way ball valve - utility model patent
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