I was mildly disappointed that he did not mention the first tabs designed to replace the pull off tabs which might have been called the push tab. You pushed down and voila! the can opens. Of course, you’d often end up bleeding into your drink when you cut your finger on the opening edge. Needless to say, this design was fairly quickly replaced with what we are used to today. Also, I always amused to find that the tool to open flat top beverage cans was called a ‘church key’.
