Inventor (1906-1971) best known for inventing the first fully electronic television system. Signed technical report, The Complete DC Theory of an Opposite Stream Diode, from his personal library, 8.5 x 11, 72 pages. Signed on the front cover, “P. T. Farnsworth.” In very good condition, with toning and damp staining to cover, lightly affecting signature, as well as scattered foxing to covers. Accompanied by an FDC bearing a cachet honoring Farnsworth, signed by his wife Elma. RRAuction COA.