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I have this exact ruler that I have used for decades. It was given to me by our Moore salesman I think back in the early 1970's when he helped me design a continuous invoice multi-part document for my employer. I also have similar steel rulers from Data Documents Inc. and Arnold Graphics Industries from that era. The above description is incorrect in that these rulers date back to the use of the train (chain) printers, many of which had a fixed type chain of only 10 characters per inch, used a single font, and used a wide fabric roll ribbon. The train had multiple sequences of alphabet, numbers, and punctuation marks on it, and hammers fired to make the impressions as the letters spun past. These printers used roll-type ribbons which would print 132 characters wide on our 11x14 7/8 inch paper.