An air curtain established in a free air space by allowing partly a first air current to pass one or a plurality of nozzles and to form one or a plurality of directed narrow air jets and partly a second air current by means of co-ejection to form a surface layer for the air ... 

Powerless Wind Turboventilator to ventilate the Building with No Electricity, No Maintainance, No. Noise, No Back Draft, No Rain Water, No Birds, No Dust Model 28 Model 32 Effective throat Dia. 21" 24" Overall Height 350mm ... 

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An impeller shaft turning device is disclosed, for use in rotating the shaft of an impeller within a housing in a revolving machine, to aid in impelling material into a bag, the impeller shaft turning device comprising motor means operative to rotate the shaft of an impelle... 

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