Thatcher Calculator Instrument, patented by Edwin Thatcher, November 1881, Keuffel & Esser, New York, with inner sliding cylinder, outer rotating "envelope" with printed scales, lacquered brass fittings, and mahogany base, in original mahogany case with label of Keuffel & Esser Co., Manufacturers of Mathematical & Surveying Instruments, 127 Fulton St. & 42 Ann St., New York, wd. 22 1/2 in.
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