question: Når begynte de å bruke hjelmer i hockey?
answers.text: 1979
context: Hockey helmet
  I august 1979 kunngjorde den daværende presidenten for National Hockey League (NHL), John Ziegler, at beskyttende hjelmer ville bli obligatoriske for innkommende spillere i NHL. "Innføringen av hjelmregelen vil være en ekstra sikkerhetsfaktor," sa han. Regelen tillot spillere som signerte profesjonelle kontrakter før 1. juni 1979 å fortsette å ikke bruke hjelm forutsatt at en ansvarsfraskrivelse ble signert, hvis de ønsket det. Den siste spilleren som spilte uten hjelm var Craig MacTavish, som spilte sin siste kamp i sesongen 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