Delweddau Diwydiant
Pori ‘M’
- MAILE, Ben (1922 - )
- MANCINI, Frederick (1905 - 1990)
- manufacturer unknown
- MARKHAM, Rosemary H.
- MATTHEWS, Harry
- MCCABE, P.M.
- MCCORMICK, Arthur David (1860 - 1943)
- McCorquodale Studio
- MERRIOTT, Jack (1901 - 1968)
- MILES, Arthur
- MILLS
- MOHRMANN, John Henry (1857 - 1916)
- MOORE, F.
- MORGAN, Gwyn
- MORGAN, Ivor
- MORGAN, Will
- MORRIS, C. Granville
- MORRIS, William
- MOXON, James
- MURRAY WHATLEY, M. S.