The bifurcated upper end of {HEAD ~ the vertical leg} of {TAIL ~ the support arm} is connected to the upper end of the feed arm 22 by means of an upper layer feed rod 37 
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The bifurcated upper end of { HEAD ~ the vertical leg } of { TAIL ~ the support arm } is connected to the upper end of the feed arm 22 by means of an upper layer feed rod 37
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH