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National transportation safety board

United States government investigative agency for civil transportation accidents

Pronunciation
/ˈnæʃənəl ˌtræntspərˈteɪʃən ˈseɪfti bɔrd/
/ˈnaʃənəl ˌtrɑːnspɔːˈteɪʃən ˈseɪfti bɔːd/