NPRNTeitlMath O SaflePerthynasNPRN415671TeitlMill, Floor 6, Diffwys Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN421260TeitlCounter-Balance Incline Between Floors 5 and 6, Diffwys QuarryMath O Saflen/aPerthynasAssociated withNPRN85487TeitlDiffwys Casson Slate QuarryMath O Saflen/aPerthynasPart of