Inventor known as “the father of radio” for his pioneering work in wireless telegraphy. TLS, one page, 8.5 x 11, personal letterhead, October 10, 1955. Letter to a radio enthusiast. In part, “I can write to you at this late date congratulating you as having been an early radio amateur who has witnessed the unbelievable progress of radio amateur and broadcasting work. Truly, today’s vast development of radio passes the wildest dreams of our early imagination.” In fine condition, with a light shade of toning and three dings to right edge. R&R COA.