According to {HEAD ~ another aspect} of {TAIL ~ the present invention}, a conical nozzle cap mounted on the front side of the housing around the nozzle tip and adapted to guide currents of air passing through the open spaces to the outside of the housing 
According to { HEAD ~ another aspect } of { TAIL ~ the present invention } , a conical nozzle cap mounted on the front side of the housing around the nozzle tip and adapted to guide currents of air passing through the open spaces to the outside of the housing
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