These cookies are absolutely essential for our website to function properly.
We use Google Analytics to measure how you use the website so we can improve it based on user needs.
These cookies may be set by third party websites and do things like measure how you view YouTube videos.
Amgueddfa Cymru – Museum Wales
National Coal Board Certificate of Authority as a Competent or Authorised Person. Issued to Granville David Thomas at Cwmcarn Colliery who is "authorised to be an Apprentice Mechanical carrying out his training above and below ground". Dated 23 August 1963. Black print on white paper with handwritten details.
