Pori’r Slipiau


Trawsgrifiad y Slip

< I'r Slip BlaenorolI'r Slip Nesaf >3a-001844

awyr - dim awyr

It often happens in a coalmine that owing to some fault in the ventilation system the air is prevented from traversing all parts of the mine. Work stops in the affected areas.

NLW 1134. C. 15