72087575
Dec 18, 1959
May 9, 1961
Great Axial Flow Fans with Blades Adjustable While Running for Use in Air Conditioning Plants, Suction Draught Ventilators and Underblast Ventilators for Boilers, Fresh Air Ventilators and Suction Draught Ventilators for Cement Kilns and Agglomeration Kilns
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