Safety of machinery; auditory danger signals; general requirements, design and testing (ISO 7731:1986, modified); german version EN 457:1992
German title
Sicherheit von Maschinen; Akustische Gefahrensignale; Allgemeine Anforderungen, Gestaltung und Prüfung (ISO 7731:1986, modifiziert); Deutsche Fassung EN 457:1992
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