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<http://www.engineerfriend.com/2012/employer-guide/engineering-manufacturing-companies/ptt-group-%E0%B8%9A%E0%B8%A3%E0%B8%B4%E0%B8%A9%E0%B8%B1%E0%B8%97-%E0%B8%9B%E0%B8%95%E0%B8%97-%E0%B8%88%E0%B8%B3%E0%B8%81%E0%B8%B1%E0%B8%94-%E0%B8%A1%E0%B8%AB%E0%B8%B2%E0%B8%8A%E0%B8%99/>