Edwin H. Armstrong and Marion Armstrong with the First Portable Superheterodyne Radio Receiver, 1923

Edwin H. Armstrong was a pioneer of radio engineering, credited as the inventor of FM radio. In 1918 he filed a patent for the superheterodyne radio circuit. This technology increased the sensitivity and selectivity of radio receivers. The radio depicted is the first portable superheterodyne radio receiver ever made. Armstrong gave it to his wife, Marion, on their 1923 honeymoon.