'Radio pioneer Lee De Forest is seen here with his Audion, this type of tube which he patented in 1907'
Vacuum tube
THE 19-AUGHTS: Radio pioneer Lee De Forest is seen here with his Audion, this type of tube which he patented in 1907
Radio pioneer Lee De Forest is seen here with his Audion, this type of tube which he patented in 1907
Radio pioneer Lee De Forest is seen here with his Audion, this type of tube which he patented in 1907
THE 19-AUGHTS
Vacuum tube
THE 19-AUGHTS