Prolific American inventor (1873–1961) often referred to as “the father of radio” for his pioneering work in wireless telegraphy. Bank check, 6.25 x 2.75, filled out and signed by de Forest, payable to Bekins Van & Storage Co. for $8.25, July 20, 1948. In very good condition, with moderate show-through from stamps on reverse, bank stamp touching top of signature, and scattered toning. RRAuction COA.