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Men's 400 metres world record progression
The first world record in the 400 m for men (athletics) was recognized by the International Amateur Athletics Federation, now known as the International Association of Athletics Federations, in 1912. The IAAF ratified Charles Reidpath's 48.2 performance set at that year's Stockholm Olympics as a world record, but it also recognized the superior mark over 440 yards (402.34 metres) run by Maxie Long in 1900 as a world record.
To June 21, 2009, the IAAF has ratified 23 world records in the event.〔
〕
The following tables show the world record progression in the men's 400 metres, as ratified by the IAAF.
==Records 1912–1976==
(+) plus sign denotes en route time during longer race
"y" denotes time for 440 yards, ratified as a record for this event
"A" indicates that the time was set at altitude.
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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