ZN414 integrated circuit

The idea
The production of a cheep and efficient 5 transistor microchip for basic radio set cercuit functions. It was chips like this that lead to a lot smaller pocket radios.

Manufacturing
The then standard silicon\germanium etching process.

Casing
It is inside a 3 metal legged, plastic/epoxy TO-92 transistor packing unit shell or a 3 metal legged, epoxy\resin filled metal TO-18 transistor packing unit shell.

Also see

 * 1) Science
 * 2) Integrated circuits
 * 3) Ferranti
 * 4) Radio