How To Open A Can Without A Can Opener?

Today, cans are sealed with a roller. A seaming head pushes the lid from above while a another roller on the side curls the edge of the lid around the edge of the can. You can simply rub the can against the concrete to thin the metal out. The friction cuts through the top, which makes it easier for you to open the can. Below you can see this demonstrated in a video.

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