When I was a kid we had a drawer in the kitchen that held a half-dozen can openers designed by American Can Company. The ones we called “churchkeys” were used to pierce flat-topped steel cans, long before the invention of the tab pull opening.
Now a company in the Northwest is attempting to revive the flat-topped can. From what I can tell by looking at their video, it is a three-piece can that appears to be made from steel instead of aluminum. Here’s the link.
This of course made me think of our old chuchkeys and that in turn made me wonder how the term was coined in the first place. It turns out – no surprise! – that controversy abounds, and that if one wants to go deep into this topic there may be no limit: Link here.