DIN EN ISO 28781:2010-12 Petroleum and natural gas industries - Drilling and production equipment - Subsurface barrier valves and related equipment (ISO 28781:2010); English version EN ISO 28781:2010
2010DIN EN ISO 28781:2010-12 Petroleum and natural gas industries - Drilling and production equipment - Subsurface barrier valves and related equipment (ISO 28781:2010); English version EN ISO 28781:2010
2010DIN EN ISO 28781:2010 Petroleum and natural gas industries - Drilling and production equipment - Subsurface barrier valves and related equipment (ISO 28781:2010); English version EN ISO 28781:2010