Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,100 pages of information and 233,633 images on early companies, their products and the people who designed and built them.
of 48 Avenue Street, Bridgeton, Glasgow, Scotland. T. A.: "Marr, Downie, Glasgow." Code: Marconi International. Telephone: Glasgow, Bridgeton 1070. (1922)
Ditto Address. Telephone: Glasgow, Bridgeton 2117. Cables: "Mardowni, Glasgow." London Office: 56 Victoria Street, SW1. Telephone: Victoria 2849. Manchester Office: 14 Brown Street. Telephone: Blackfriars 1418. (1947)