other scrolling controls on a mouse, and the use of a wheel for scrolling both precede the combination of wheel and mouse. the earliest known example of the former is the "mighty mouse" prototype developed jointly by ntt, japan and eth zürich, switzerland (kunio ōno, ken'ichi fukaya and jürg nievergelt) in 1985. it had a thumb-operated combined analog button/toggle switch on the side for smooth scrolling.