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| Colliery Engineering | June, 1929 |
The New Mining Department, Armstrong College
Drawings and Photographs accompanying the article
Fig. 9 — Air Duct to Roof Ventilator, used for Experimental Purposes
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Fig. 9 — Air Duct to Roof Ventilator, used for Experimental Purposes
Image Reference: L-00390-03-0065-F09
Article reproduced from a copy of the magazine held at National Mining Museum Scotland, Newtongrange, Midlothian.
Contains public sector information licensed under the 
