Technograph and Telegraph
1963 Technograph Electronic Products was a leading maker of printed circuit boards; the printed circuit interests of Telegraph Condenser Co were merged with Technograph and the company renamed Technograph and Telegraph[1]; formed Pye Printed Motors of Cambridge, as JV with Pye Ltd[2]
Presumably later had a subsidiary Technograph Microcircuits
1980 The company was owned by Wallace Brothers, Plessey Co and the NRDC. It was acquired by RHP[3]
1984 The printed circuit board subsidiary was closed by RHP[4].