SCIENTIFIC INSTRUMENTS
A THATCHER'S CALCULATING INSTRUMENT, by Keuffel & Esser and Company, No. 4012/5611, with rotating central cylinder in a fitted mahogany case with maker's mark and instruction manuel--24½in. long
Details
A THATCHER'S CALCULATING INSTRUMENT, by Keuffel & Esser and Company, No. 4012/5611, with rotating central cylinder in a fitted mahogany case with maker's mark and instruction manuel--24½in. long