NF L10-034-3*NF EN 4050-3:2013 Aerospace series - Test method for metallic materials - Ultrasonic inspection of bars, plates, forging stock and forgings - Part 3: reference blocks
2013NF L10-034-3*NF EN 4050-3:2013 Aerospace series - Test method for metallic materials - Ultrasonic inspection of bars, plates, forging stock and forgings - Part 3: reference blocks