Plessey Company, 'The silicon age : telecommunications ', (Ilford : Plessey, 1983); http://en.wikipedia.org/wiki/Plessey;
T/1976-623
Plessey Company, 'The silicon age : telecommunications ', (Ilford : Plessey, 1983); http://en.wikipedia.org/wiki/Plessey;
T/1976-623