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An accounting machine, or bookkeeping machine or recording-adder, was generally a calculator and printer combination tailored for a specific commercial activity such as billing, payroll, or ledger.[1][2] Accounting machines were widespread from the early 1900s to 1980s,[3] but were rendered obsolete by the availability of low-cost computers such as the IBM PC.
^"READIX General Purpose Computer". ADP Equipment (Bull Machine Company Gamma 60; Philco Transac S-2000 Data Processing System Enclosed) Reports: 209–219 (543–553). 1 November 1957.
Brown, Richard Hunt. (1955). "20. PRINCIPAL ELECTRONIC BUSINESS COMPUTERS. GENERAL DESCRIPTIONS, PICTURES AND PRICES". Underwood ELECOM 50 Computer. Office automation; integrated and electronic data processing. New York: Automation Consultants. p. 148. hdl:2027/mdp.39015021085249.