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Here is the first one patented in 1858. Very similar to yours
http://connecticuthistory.org/the-first-us-can-opener-today-in-history/
That's pretty darn cool. Collecting cast iron cookware seems to lead to other side collections. My second addiction lately has been quality stainless steel utensils. Serving spoons, spatulas, ladles, etc... If I could find these in cast iron, wow....
It's fun to collect other kitchen tools.