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Coal sales and export organisation
1874 T. J. Callaghan (1858- ) began his commercial career with Gueret which company later became Gueret, Llewellyn, Merrett Ltd., Coal Exporters & Shipbrokers. For many years he was Chairman of the Company.
1930 Amalgamated with several collieries into Welsh Associated Collieries
By 1934 the company had become associated with GKN; as a result T. J. Callaghan became a director of GKN.
1936 Welsh Associated Collieries were absorbed into the Powell Duffryn Associated Collieries.