Shure 55SH
In 1931, Shure and engineer Ralph Glover began developing Shure's first microphone, and the following year the Model 33N two-button carbon microphone was introduced, making Shure one of only four microphone manufacturers in the US. In 1939, Shure introduced the Unidyne Model 55 microphone, which became one of the most recognized microphones in the world.