Slinky

Although it became the most popular toy of its time, “Slinky” was an accidental invention. Richard James, a naval engineer, was working on the construction of precision ship materials. One day, he accidentally dropped the tension spring and watched how it moved. Thus, the idea of ​​a toy emerged. Richard James immediately registered a patent for his invention. It has made Richard James a fortune, selling over 300 million pieces since 1945.