Malaysian integrated oil and gas services provider Petra Perdana Berhad (PPB) said its wholly owned subsidiary unit Petra Resources Sdn Bhd (PRSB) recently landed a contract worth RM600 million from Sarawak Shell Berhad and Sabah Shell Petroleum Company Limited to provide major maintenance, hook-up, commissioning and construction services. (US$1=RM3.8). PRSB will provide major maintenance and…