Cryptograph (coding and decoding machine) by Sir Charles Wheatstone, 1843-1875 Telecommunications 1843-1875
Silver thimble, used to pass a current through the 1866 Transatlantic cable, 1860-1866 Telecommunications 1860-1866
HTC 'One' mobile telephone used to make the first video call from Everest, 2013 Telecommunications 2013
Selenium cell from prototype Cox selenium-cell magnifier equipment, 1910-1920 Telecommunications 1910-1920