4-inch/50-caliber gun 4.50 from Paddington Swimming at the 1904 Summer Olympics – Men's 4 × 50 yard freestyle relay Swimming at the 2016 Summer Paralympics – Mixed 4 × 50 metre freestyle relay 20pts Swimming at the 2004 Summer Paralympics – Men's 4 × 50 metre medley relay 20pts Slingsby Skylark 4 2009 IPC Swimming European Championships – Men's 4 × 50 metre freestyle relay 2009 IPC Swimming European Championships – Women's 4 × 50 metre medley relay 2009 IPC Swimming European Championships – Men's 4 × 50 metre medley relay EOC 4-inch 50 caliber Swimming at the 2004 Summer Paralympics – Men's 4 × 50 metre freestyle relay 20pts 2013 IPC Swimming World Championships – Men's 4 × 50 metre medley…

y relay 2013 IPC Swimming World Championships – Women's 4 × 50 metre medley relay Swimming at the 2004 Summer Paralympics – Women's 4 × 50 metre freestyle relay 20pts 2013 IPC Swimming World Championships – Men's 4 × 50 metre freestyle relay 2013 IPC Swimming World Championships – Women's 4 × 50 metre freestyle relay Swimming at the 2004 Summer Paralympics – Women's 4 × 50 metre medley relay 20pts 2014 IPC Swimming European Championships – Women's 4 × 50 metre medley relay 2014 IPC Swimming European Championships – Men

's 4 × 50 metre medley relay 2014 IPC Swimming European Championships – Men's 4 × 50 metre freestyle relay 2018 World Para Swimming European Championships – 4 × 50 metres medley relay 2014 IPC Swimming European Championships – Women's 4 × 50 metre freestyle relay 2018 World Para Swimming European Championships – 4 × 50 metres freestyle relay 4.7-inch/50-caliber Mark 3 gun 2014 FINA World Swimming Championships (25 m) – Men's 4 × 50 metre medley relay Isaiah 50 2014 FINA World Swimming Championships (25 m) – 4 × 50 metre mixed medley relay 2014 IPC Swimming European Championsh