IBM 6400 Accounting Machine

The IBM 6400 Accounting Machine is a series of four calculating and accounting machines produced by the IBM Electric Typewriter (ET) division in 1962. It was announced in January 1963 and was sold to perform what IBM referred to as BICARSA, which stood for billing, inventory control, accounts receivable and sales analysis.

Source: Wikipedia — IBM 6400 Accounting Machine (CC BY-SA 4.0)