Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,446 pages of information and 233,880 images on early companies, their products and the people who designed and built them.
1944 Modern Telephone Company, of Tottenham Court Road, London, was advertising master switchboard for office telephones.
1957 Private company.
1961 Service engineers for internal telephones and public address systems. 
1960s Acquired by Shipton Automation.
1969 Admitted to the list of Post Office approved suppliers of private automatic branch exchange equipment