Excerpt:
1642 Pascal's calculator
At age 19, Blaise Pascal (France) constructs the first mechanical calculator and offers it for sale. The machine is capable of adding and subtracting.
[Oxford Reference English Dictionary (1996): under "Pascal" and "Appendix 2 - Chronology of Scientific Developments"]
1647: Leibniz
1674 Leibniz's machine
Gottfried Leibniz (Germany) designs a machine for multiplication and division.
[Oxford Reference English Dictionary (1996): under "Leibniz" and "Appendix 2 - Chronology of Scientific Developments"]