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Penallta Colliery, plan
Messrs Powell Duffryn Steam Coal co. ltd. Re Penallta Colliery. Arrangement for one Zoelly-Mixed-Pressure-Steam-Turbo-Compressor 40000 cub.ft.M 2900-3100 R.P.M Zoelly- Turbine with B.B.C Compressor Scale 1/30th 9.4.24 No.222428
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