Further, {HEAD ~ serrated metallic reinforcing edges} may be mounted to {TAIL ~ free ends} of the shield to enhance their being directed interiorly of a ground surface 
mounted to
Further , { HEAD ~ serrated metallic reinforcing edges } may be mounted to { TAIL ~ free ends } of the shield to enhance their being directed interiorly of a ground surface
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH