A R Mason
1917 “in charge” at Moelfre
Managing director? of Arthur R Mason Ltd which was the operator at Castle Slate Quarry, Dolwyddelen, Caernarvonshire, 1922–1928
1917 “in charge” at Moelfre
Managing director? of Arthur R Mason Ltd which was the operator at Castle Slate Quarry, Dolwyddelen, Caernarvonshire, 1922–1928