Prolific American inventor (1873–1961) often referred to as ‘the father of radio’ for his pioneering work in wireless telegraphy. Vintage bold ink signature, “Yours in Radio, Lee de Forest, July 11, ’29,” on an off-white 4.5 x 3 custom-made collector’s card with a clipped July 11, 1929, Grand Central Station, New York, postmark affixed to upper right corner. In fine condition, with a bit of scattered light soiling, mild haloing to the ink, and mounting remnants to reverse from previous display in a scrapbook. RRAuction COA.
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