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Show 'ni iiu.i hijiwmiwiwu mm iwwnin.niww wiwiwwjimumiww.l-,-"ll ""- "" I ' " ' ' ' . , - "' - i r .,,. lr v ' : ' - - I y i-y. . - : j ' " ' ' ' ' , ' , ' ' ' t - 4 i . , ,, , ','-' ' , I ' ' ? ' ; If'' ' t , t , ' A f - ; I ' i - v ;- -f" "i & hi 1 J A - , ' i i i " t so"' ? i ' :Jj 7''": I ': ,y ',' y:"' 4 Prof. John E. Willson, left, chairman of U. Mining and Geological Engineering Department, and Veloy Piecioni, graduate student from Helper, inspect model fan equipment for use in mine ventilation experiment. |