Lee De Forest Autograph
Signed album page, 4,5 x 2, mounted for display with a photograph, shows Lee de Forest as inventor (altogether 8,25 x 11,75 inch), signed in dark fountain pen, in very fine condition.
|Profession||American inventor - invented the Audion, a vacuum tube that takes relatively weak electrical signals and amplifies them|
|Size in inch (1 inch = 2.5 cm)||4,5 x 2 (altogether 8,25 x 11,75)|
|Type of Autograph||cards / album pages|
|More on Wikipedia||More information on Wikipedia|