2. Sony Walkman
Year Invented: 1970
Designer: Akio Morita and Mazaru Ibuka
When Sony's Akio Morita and Masaru Ibuka became unhappy with the weight of their portable tape recorder, the Pressman, they decided to refine it with a stereo amplifier. The new product, the Walkman, soon took off. Sony had to design new machinery to handle the growing demand.