4 set USPS stamp issues saluting various electronic fields:

(1) 'Marconi's Spark Coil' honoring Guglielmo Marconi's spark coil and spark gap, which enabled wireless radio transmissions across the Atlantic Ocean.

(2) ' Transistors and Circuit Board' celebrates the invention of the transistor by Bell Telephone Laboratories in 1948 making its miniaturization opening the doors for pocket radios and computer parts.

(3) 'Electronic Components' celebrating progress in  component parts in the electronic field.  Depicted Emile Berliner's microphone, Thomas Edison's vacuum tube and Vladimir Zworykin's photoelectric cell which brought television in 1928.

and

(4)'DeForest Audions', invention of an electronic or amplifying vacuum tube by Lee de Forest in 1906. It was the firs triode consisting of an evacuated glass tube containing three electrodes, a heated filament cathode, a grid and a plate (the anode)-the first widely used electronic device that could amplify.

This mint set collection comes with an attractive display mount.