The base 10 is further provided with {HEAD ~ a protective cover} 70 corresponding in {TAIL ~ location} to the tool set 60 and capable of moving up and down by means of a pull rod 71 for covering the tool set 60 
The base 10 is further provided with { HEAD ~ a protective cover } 70 corresponding in { TAIL ~ location } to the tool set 60 and capable of moving up and down by means of a pull rod 71 for covering the tool set 60
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL 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 OTH OTH OTH OTH OTH