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API Bop for Oilfield Drilling Equipments Cameron Shaffer Type Spherical Annular Bop, Find Details and Price about Type Spherical Annular Bop 21 1/4"-5000psi from API Bop for Oilfield Drilling Equipments Cameron Shaffer Type Spherical Annular Bop - Shandong Rosenwell Petroleum Technology Co., Ltd.