B62-718. COMBINATION SQUARE. Duby & Shinn Universal. Patented in 1902 by Joseph Duby and manufactured by Duby & Shinn of New York, the two square legs are set in a steel base at angles and joined together with a dovetail joint, according to the patent it can be used to lay out circles and all manner of angles. According to a 1906 Popular Mechanics ad, it was offered in three sizes; we're not sure how they measured them but the legs of this one are 7-1/2" and 9". It looks like it had a copper wash that has mostly worn off, but otherwise very clean. Fine 80-150