oit. PT. PETRO OIL TOOL CERTIFICATE THIS IS TO CERTIFY THAT JAMSURI \ : m Has Successfully Completed in Training Post Weld Heat Treatment ( PWHT ) Training By Panasindo Jaya Mandiri, PT On Friday, February 06, 2015 J> "> Heriri Silalahi Instructor f '•' < TOOI Yullana Rante Salu HRD & GA Dept. ^> ',