prEN 2098-4-1981 Aerospace series; inspection and testing requirements for titanium and heat resisting alloy wrought products; part 4: inspection and testing requirements for tubes
1994PREN 2098-4-1994 Aerospace Series Inspection and Testing Requirements for Titanium and Heat Resisting Alloy Wrought Products Part 4 - Inspection and Testing Requirements for Tubes (Edition 2)
1981prEN 2098-4-1981 Aerospace series; inspection and testing requirements for titanium and heat resisting alloy wrought products; part 4: inspection and testing requirements for tubes