Draft Document - Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO/DIS 27509:2019); English version prEN ISO 27509:2019, only on CD-ROM
文件草案-石油和天然气工业-带IX密封圈的紧凑型法兰连接(ISO/DIS 27509-2019);英文版prEN ISO 27509:2019 仅CD-ROM版