Prolific American inventor (1873-1961) often referred to as 'the father of radio' for his pioneering work in wireless telegraphy. Vintage glossy 4 x 5 photo of de Forest hard at work, signed in blue ballpoint, "Lee de Forest, Mar 18 57." In very good to fine condition, with a paperclip impression to the top edge, and surface impressions from typed notations on the back.
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