John Logie Baird's original experimental television apparatus, 1925-1926 Radio Communication 1925-1926
Rexophone crystal set with two pairs of Telefunken headphones (out of three), 1923-1930 Radio Communication 1923-1930
six-stage super heterodyne receiver processed on the ECME system, 1936-1955 Radio Communication 1936-1955
horseshoe magnet and keep used with experimental form of magnetic detector, 1900-1910 Radio Communication 1900-1910