Wheee!

https://www.frbsf.org/economic-research/files/el2018-07.pdf

https://www.nytimes.com/2018/06/25/business/what-is-yield-curve-recession-prediction.html?login=email&auth=login-email

(Looks like the only time it missed was around 1966, although maybe around 1977 there was a pretty long lead-time.)