UNE-EN 4807:2017 Aerospace series - Flange couplings - Weld coupling, 90° elbow, in heat resisting steel - Inch series (Endorsed by Asociación Española de Normalización in June of 2017.)
2017UNE-EN 4807:2017 Aerospace series - Flange couplings - Weld coupling, 90° elbow, in heat resisting steel - Inch series (Endorsed by Asociación Española de Normalización in June of 2017.)