Yup, that’s right – there is a Vintage Calculators Web Museum. It is an excellent site about the birth and development of all sorts of calculators. Their timeline boasts coverage from year 1600 till year 1980. You will find a whole bunch of pictures, links to other resources, references to books, frequently asked questions (and answers) and much more.
If you ever wanted to know anything about a calculator, this is site is an excellent starting point. Now, what was that “2+2=?” question? :)