C.-3a.
ARRANGEMENT OF "SIROCCO" FAN (DOUBLE INLET UPCAST TYPE). FOR MINE VENTILATION. To illustrate Report by the Inspecting Engineer of Mines. NEW ZEALAND. 1909.
C.-3a.
ARRANGEMENT OF "SIROCCO" FAN (DOUBLE INLET UPCAST TYPE). FOR MINE VENTILATION. To illustrate Report by the Inspecting Engineer of Mines. NEW ZEALAND. 1909.
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