Model of open oscillator with spherical radiators used by Heinrich Hertz, 1949 Radio Communication 1949
horseshoe magnet and keep used with experimental form of magnetic detector, 1900-1910 Radio Communication 1900-1910
Experimental television receiver used by JL Baird in demonstration, made 1925-1926 Radio Communication 1925-1926
Rexophone crystal set with two pairs of Telefunken headphones (out of three), 1923-1930 Radio Communication 1923-1930