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"Have a smaller version that has only 5 columns, with a 6 digit readout display. Came from Wertheimer Cattle Co., Montgomery, Ill.Was used for years by two generations of owners. Burroughs Adding Machine Company, Detroit, Mi listed on back as the Mfgr.Ser # stamped into the bottom: 5A121988. Bought at an estate sale.I am a retired 34 year employee of Burroughs/Unisys Corp.Very rare to see a small one like this during my employment there."