The P-38, developed in 1942, is a small can opener that was issued in the canned field rations of the United States Armed Forces from World War II to the 1980s. The can opener is pocket-sized, approximately 1.5 inches (38 mm) long, and consists of a short metal blade that serves as a handle, with a small, hinged metal tooth that folds out to pierce the can lid.
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The P-38 can opener is better than any electric can opener I have ever owned. It is dependable and get the job done. My wife refuseds to use an electric opener.