The 1917 NHL championship was won by the Toronto Arenas.
1917
Then NHL was formed in 1917. This answer is from ChaCha answers.
The NHL was founded on November 26, 1917, and the first games were played on December 19, 1917.
Nov. 26, 1917: The NHL was founded. Teams included the Montreal Canadiens, Montreal Wanderers, Ottawa Senators, Toronto Arenas, and Quebec Bulldogs. Quebec (pictured) did not play during the 1917-18 season.
The NHL started to play on December 19, 1917.
The NHL was formed out of the National Hockey Association in 1917.
I believe it was 1917.
Headgears are recognised for a equipment for Rugby players which they wear during the field. Headgears are also used in NHL (Hockey), NFL (National Football League) and MLB (Major League Baseball). All these are use as a protective equipment.
The 1917 NHL championship was won by the Toronto Arenas.
It was never a mandatory piece of equipment to wear, but eventually it was decided to be mandatory in mid 50-60s
1917 was when the NHL was formed