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            Keuffel & Esser theodolite prototype
            One of a kind.

                     

            K&E in 1946 builds first 10 second optically read theodolite prototype for US Army Engineer
            Corps
            , but not put into production, only one made and not marked or serial numbered. Glass
            circles in degrees are read directly with micrometer to 10 seconds of arc. Height 9 inches.
            Weight 12 lbs.

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