KARACHI, Pakistan, July 17 (Reuters) - Pakistan Refinery Limited PKRF.PSX and Air Link Communication AIRL.PSX are seeking to buy a stake in Shell Pakistan SHEL.PSX, the companies said in a notice ...

State-owned Pakistan Refinery Limited and Air Link Communication , a local firm, are seeking to buy a stake in Shell Pakistan , the companies said in a notice to the stock exchange (PSX).