[经] american association of oilwell drilling contractors

měi guó zuàn jǐng chéng bāo shāng xié huì ㄇㄟˇ ㄍㄨㄛˊ ㄗㄨㄢˋ ㄐㄧㄥˇ ㄔㄥˊ ㄅㄠ ㄕㄤ ㄒㄧㄝˊ ㄏㄨㄟˋ