"If salted, contains salt"

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Back in the '60s, the office I worked in bought a microfilm reader. We opened the carton, gingerly hefted various parts out of it, including some massive pieces of glass, and laid them on the table. At the bottom of the box was a sheet headed "Instructions for Unpacking". The first instruction was to turn the carton upside down and open the bottom. That was from Eastman Kodak!