On the securing rod 309, at least two support bars 313 are fixedly mounted, and {HEAD ~ a step plate} 201 is bolted to {TAIL ~ the support bars} with at least four bolts 
is bolted to
On the securing rod 309 , at least two support bars 313 are fixedly mounted , and { HEAD ~ a step plate } 201 is bolted to { TAIL ~ the support bars } with at least four bolts
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH