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Many non-Imperial Knife Company knife makers were using the safety can opener will before 1964.If Imperial got a patent on the opener in 1944, it would have been in effect for at least 20 years, i.e. 1964. Which would have covered nearly the entire period during which the knife could have been made.
First of all most knife companies made steel liner and bolster knives for years and well before the war. Many were made like that in the 1800s. Steel makes a stronger knife and many fine old knives by US cutlery companies will exhibit these characteristics. .....