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World record progression 4 × 100 metres freestyle relay
This article includes the world record progression for the 4×100 metres freestyle relay, and it shows the chronological history of world record times in that competitive swimming event. The 4×100 metres freestyle relay is a relay event in which each of four swimmers on a team swims a 100-metre freestyle leg in sequence. The world records are recognized by and maintained by FINA ("Fédération Internationale de Natation"), the international competitive swimming and aquatics federation that overseas the sport in international competition.
World records in swimming were first recognized by FINA in 1908. The long course (50-metre pool) world records are historically older than the short course (25-metre pool) records. FINA amended its regulations governing the recognition of world records in 1956; specifically, FINA mandated that only record times that were contested in 50-metre (or 55-yard) pools were eligible for recognition after that time.〔Craig Lord, "( A Time of Change for World Records )," SwimVortex.com (28 May 2013). Retrieved 20 March 2015.〕 The short-course world records have been separately recognized since 1991.
The women's 4×100-metre event was first contested at the 1912 Summer Olympics in Stockholm, but the men's 4×100-metre event didn't appear until the 1964 Summer Olympics in Tokyo. Prior to 1964, the longer 4×200-metre freestyle relay was the only men's relay event staged.
== Men ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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