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Examinations for firebosses
Ventilation and fire fighting becoming complex as workings extend; safety appliances and accessories classified; rockdust equipment; first-aid supplies listed.
Examinations for firebosses
Ventilation and fire fighting becoming complex as workings extend; safety appliances and accessories classified; rockdust equipment; first-aid supplies listed.
Examinations for firebosses
Modern Min
Modern Mining ; 3
1927
6 pages
10 Figs.
Aufsatz (Zeitschrift)
Englisch
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