The device came to Quebec on May 10, 1965. Prior to that you needed a can opener to get at your canned brew.
Ontario didn't even have canned beer of any kind until May 3, 1965.
Of course the pull tops were also used in soda pop cans as well and became a nuisance as they polluted the environment with their sharp nasty edges.
The riveted stay tab type that we use today was developed in 1975 by an engineer who accidentally swallowed a pull top.