Apparatus carrier telephone 1 + 1W Mark 1* and 1 + 1 C : issue nr. 1 Installation of the first direct telecommunications link between the Netherlands and Denmark by means of repeatered submarine coaxial cable 1951 / Standard Telephones and Cables … handleiding Digitaal snelheidsmeten met de standaard telephone Doppler radar / [samenst.: W.B.G.M. Oude Vrielink]
