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"I have an instrument which is basically the same as shown; however it does not have the eleven holes as shown onyour model. Ithas a five minute vernier on the bottom part of the circle . It has a patent date of Dec. 2 1890 Brown &Sharpe, and has thier logo on the blade. I also have a photo of it made in 1926 when col. W. B. Townsend sold 80,000 acres of land to the state of Tennessee to become part of the Smokey Mountains National Park. This instrument belonged to my grandfather Andrew K. Gregory. I also have other surveying related instruments of his of an earlier date. Andrew is mentioned in writings by Paul Fink."