The transistor radio was invented in 1947. It allowed people to carry radios with them.

The Story of the Transistor

The Transistor Radio Nuts & Volts Magazine

working pink Emerson radio from the 50's : r/ThriftStoreHauls

Emerson transistor radio, 1958, The invention of the transi…

How The Transistor Transformed The World

Old portable radios were marvels of technology from the 1950s to the 1980s - Click Americana

Transistor radio, Ultimate Pop Culture Wiki

Groovy History

Let's Get Small SPARK Museum of Electrical Invention

TR-1 The World's First Transistor Radio – Inside the Collection