Pollitt invented a folding and sliding keyboard (Patent 5267127, assigned to IBM, Issued in Nov 93). The size of the keyboard is same as a standard keyboard when used, but very small (almost half) when dissociated in a stored position. The keyboard in the invention is segmented to two halves.

Who invented the ergonomic keyboard?

In 1994 Microsoft launched their first ergonomic keyboard, their Microsoft Natural Keyboard, which is probably one of the first ergonomic keyboards that sort of looks like the ones we commonly see today.

What are the 3 types of keyboards?