Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 138,223 pages of information and 223,604 images on early companies, their products and the people who designed and built them.
of Bute Docks, Cardiff
1891 The National Collieries in the Rhondda Valley were united with those of Abercarn and Risca under the title of United National Collieries
1892 The company was registered on 6 May. 
1927 See Aberconway Chapter 17 for information on the company and its history.