kˈʌlbɚtsən fˈoːɹ fˈaɪv ˌɛntˈiː wʌzðə fˈɜːst slˈæm bˈɪdɪŋ sˈɪstəm tə ɡˈeɪn wˈaɪdspɹɛd ɐpɹˈuːvəl; ɪt wʌz pˈɑːɹt ʌvðə kˈʌlbɚtsən sˈɪstəm θɹuː ðə nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi z, ænd wʌz pˈɑːɹt ʌvðə bɹˈɪɾɪʃ ˈækɑːl sˈɪstəm fɔːɹ mˈɛni jˈɪɹz.
Culbertson 4–5 NT was the first slam bidding system to gain widespread approval; it was part of the Culbertson system through the 1930s, and was part of the British Acol system for many years.