{TAIL ~ A portion} of {HEAD ~ the cylindrical wall} of the receptacle is provided with classifying openings, for example by providing a screened opening as a band around the receptacle 
{ TAIL ~ A portion } of { HEAD ~ the cylindrical wall } of the receptacle is provided with classifying openings , for example by providing a screened opening as a band around the receptacle
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH