1970 Cinelli clipless appeared but not popular as it required a lever to be operated by hand to enter and, dangerously, to exit.  
1983 Keywin introduced a twist in, twist out pedal which was immediately popular.
1984 Look introduced their step-in, twist out pedal. Its Delta cleat ruled supreme for many years until the recent move to the Keo design.
1985 Hinault beat Lemond in the TdF on Looks.
1987 Look Competition PP75 introduced adjustable release tension.

In the 1988 catalogue hexagonal axle caps have disappeared, replaced by a dimpled plastic cap.
From 1988 all models have a flat plate covering the spring barrel.