JACK KILBY SIGNED FIRST DAY COVER COMMEMORATING PROGRESS IN ELECTRONICS - 25 YEARS OF TRANSISTORS, "Jack S. Kilby", 6.5 X 3.75, July 10, 1973, by Nobel Prize inventor of the Microchip (integrated circuit).
Jack St. Clair Kilby (November 8, 1923 – June 20, 2005) the microchip inventor was an American electrical engineer who took part (along with Robert Noyce) in the realization of the first integrated circuit while working at Texas Instruments (TI) in 1958. He was awarded the Nobel Prize in Physics on December 10, 2000. Kilby is also the co-inventor of the handheld calculator and the thermal printer, for which he has the patents. In 1982, he was inducted into the National Inventors Hall of Fame.