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AECMA PREN 2054-1995 history
1995AECMA PREN 2054-1995 Aerospace Series Folded Profiles U-Section with Externally Lipped Flanges in Aluminium and Aluminium Alloys Dimensions Edition 2
1976AECMA PREN 2054-1976 U-Section - Aluminium Alloy Folded Profiles with Externally Lipped Flanges Dimensions Aerospace Series Edition 1