Question:
Who was the chair of Swedish Ice Hockey Association in May, 1957?

Context:
 Ove Rainer is the chair of Swedish Ice Hockey Association from Sep, 1973 to Sep, 1978. 
 Rickard Fagerlund is the chair of Swedish Ice Hockey Association from Sep, 1983 to Jun, 2002. 
 Christer Englund is the chair of Swedish Ice Hockey Association from Jun, 2004 to Jun, 2015. 
 Anton Johanson is the chair of Swedish Ice Hockey Association from Nov, 1924 to Oct, 1948. 
 Helge Berglund is the chair of Swedish Ice Hockey Association from Oct, 1948 to Sep, 1973. 
 Isaac Westergren is the chair of Swedish Ice Hockey Association from Nov, 1922 to Nov, 1924. 
 Arne Grunander is the chair of Swedish Ice Hockey Association from Sep, 1973 to Sep, 1983.

Answer:
Helge Berglund