{HEAD ~ The base} 10 is further provided with {TAIL ~ a protective cover} 70 corresponding in 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 
{ HEAD ~ The base } 10 is further provided with { TAIL ~ a protective cover } 70 corresponding in 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
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH