The transistor radio changed the face of the way we listen to music. Billions of them were produced in the 50's and 60's. The first mass produced, portable music device exposed a generation to the glory of rock and roll (provided you had a case of 9 volt batteries to power). Lo-Fidelity and subject to regular disruptions in service due to the nuances of the AM frequencies it showcased, the device was, nonetheless, revolutionary.
Sarah has an astounding collection which highlights the boss designs of the era.
Found at the always entertaining: coisas do arco da velha