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I worked for General Motors in the late 60"s and 70"s. It seems that everybody in computer programming, data processing and data entry had a Moore Business Forms ruler. I did not work in any of these departments but interacted with them. I greatly admired the ruler and finally found someone in one of the departments to give me one. I still have it today and cherish it as much today as I did back then. My ruler is only 16 inches long with rounded corners. There are large holes which are 13/32 inches in diameter, set 2 3/4 inches and 4 1/4 inches center to center. It has another set of holes like these but are 1/4 inch in diameter. Memories are great.