World record progression 4 × 100 metres medley relay

This article includes the world record progression for the 4×100 metres medley relay, and it shows the chronological history of world record times in that competitive swimming event. The 4×100 metres medley relay is a medley race in which each of four swimmers on a team swims a 100-metre leg of the relay, each swimming a different stroke, in the following sequence: Backstroke (this can only be the first stroke, due to the necessity of starting this leg in the pool rather than by diving in) Breaststroke Butterfly Freestyle ("freestyle" means anything swum on the front – most swimmers use the front crawl).

Source: Wikipedia — World record progression 4 × 100 metres medley relay (CC BY-SA 4.0)