dʒˌiːˈiː jˈuːzd ɐ dˈʌbəl bˈaɪpæs slˈæʃ hˈaɪbɹɪd fˈæn ɚɹˈeɪndʒmənt, bˌʌt tə dˈeɪt hɐz nˈɛvɚ dɪsklˈoʊzd pɹɪsˈaɪsli hˌaʊ ðeɪ ɛksplˈɔɪɾᵻd ðə kˈɑːnsɛpt.
GE used a double bypass/hybrid fan arrangement, but to date has never disclosed precisely how they exploited the concept.