A third improvement comprises a sweepable member having a chamfered edge in a sweep direction, the edge making {HEAD ~ an angle} of {TAIL ~ between about 5 8 degrees} with the plane of the path 
A third improvement comprises a sweepable member having a chamfered edge in a sweep direction , the edge making { HEAD ~ an angle } of { TAIL ~ between about 5 8 degrees } with the plane of the path
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH