Original vintage food packing industry trade magazine ad for AMERICAN CAN COMPANY of New York City, NY.  Why Talk About a Pig's Shoulder to You?  In testing meat can linings, pork shoulder is unique.  It combines fats and other chemical, including sulphur bearing materials whose action  upon the enamel is unusually severe.  That's why pork shoulder is a favorite and standard test-pack at our Central Research Laboratories, Maywood, IL.  Old 1946 canning and processing advertisement.