mine-run coal：原煤

"mine resistance","通风阻力 ; 矿阻" | "mine-run coal","原煤" | "mine salting","矿石渗杂"

PA: Pennsylvania：美国宾夕法尼亚州州名

ancestry 祖先(集合称), 家系, 血统 | Pa. Pennsylvania 美国宾夕法尼亚州州名 | booster locomotive 辅助机车

corrugate steel fibers：卷曲钢纤维

corrosion inhibiting, , admixture 防锈掺会料 | corrugate steel fibers 卷曲钢纤维 | corrugated aluminium 波状铝板