Did you know where the name computer first came from?
In 1884, Dr. E. Felt, an American, took a big step forward by inventing a device called "Comptometer" This device had various buttons that could be used to perform mathematical calculations, and it is considered the first successful example of a calculator with keys

In 1884, Dr. E. Felt invented the Comptometer, a device with buttons for performing mathematical calculations. It’s considered one of the earliest examples of a calculator with keys