What was the first product that IBM sold?

The first product that IBM sold was a counting machine (tabulator). The machine provided a way of processing information or data by putting it in a table. This didn't mean the kind of table you eat off of, though. It refers to a table, or chart, with rows and columns. When using this machine to tabulate, calculations are made and recorded.

It was Charles R. Flint who arranged the merger of the International Time Recording Company, Computing Scale Company, and the Tabulating Machine Company to form the Computing-Tabulating-Recording Company (C-T-R). The new company was based in New York City and had approximately 1,300 employees. George Fairchild became the first chairman of the board of directors. C-T-R was renamed International Business Machines (IBM) Corporation in 1924.