question: Hvornår begyndt man at bruge hjelme i hockey?
answers.text: 1979
context: Hockey helmet
  I august 1979 meddelte den daværende formand for National Hockey League (NHL), John Ziegler, at beskyttelseshjelme ville blive obligatoriske for nye spillere i NHL. "Indførelsen af hjelmreglen vil være en yderligere sikkerhedsfaktor", sagde han. Reglen gjorde det muligt for spillere, der underskrev professionelle kontrakter før den 1. juni 1979, fortsat at undlade at bære hjelm, forudsat at de underskrev en ansvarsfraskrivelse, hvis de ønskede det. Den sidste spiller, der spillede uden hjelm, var Craig MacTavish, der spillede sin sidste kamp i sæsonen 1996-97 for St. Louis Blues.
answers_en.text: 1979
context_en: Hockey helmet
  In August 1979, the then-President of the National Hockey League (NHL), John Ziegler, announced that protective helmets would become mandatory for incoming players in the NHL. "The introduction of the helmet rule will be an additional safety factor," he said. The rule allowed players who signed professional contracts prior to June 1, 1979 to continue to not wear a helmet provided a liability waiver was signed, if they so desired. The last player to play without a helmet was Craig MacTavish, who played his final game during the 1996–97 season for the St. Louis Blues.
title_en: Hockey helmet