1. Assignment of Letters Patent (554027) from Thomas David Jones, Y Fenni, Bettws-y-Coed Road, Cyncoed to the Trustees of the Monmouthshire and South Wales Coal Owners' Association. The patent was for improvements in or relating to gas filters and to mine-dust extractors. Dated 11 Apr 1945 and stamped 4 May 1945.
2. Assignment of Letters Patent on the appointment of new Trustees of the Monmouthshire and South Wales Coal Owners' Association. The patents relate to the treatment of dust laden air and the suppression and reduction of dust in coal cutting. 11 Apr 1945.
3. Trust Deed for Letters Patent. The patents referred in the Trust Deed are those referred to in the other two documents within the file.