A Thatcher's rotary calculator by Keuffel & Esser, New York, No. 4012, with instructions on baseboard and mahogany case with Keuffel & Esser label in lid --24in. wide

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A Thatcher's rotary calculator by Keuffel & Esser, New York, No. 4012, with instructions on baseboard and mahogany case with Keuffel & Esser label in lid --24in. wide

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