HC Deb 28 February 1968 vol 759 c390W
Mr. Concannon

asked the Minister of Power how many coalmines produce coal at above 45 hundredweights per man shift.

Mr. Freeson:

During the 52 weeks ended 25th March, 1967, 92 coal mines had a productivity of more than 45 cwt. per manshift overall.

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