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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
    , 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.