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DIN EN 1793-4
Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - Intrinsic sound diffraction; German version EN 1793-4:2025
Project
prEN ISO 21987 rev
Ophthalmic optics - Mounted spectacle lenses
Project
DIN EN ISO 21987 rev
Ophthalmic optics - Mounted spectacle lenses
