The extension of the powder material for sintering to form the thin layer and {TAIL ~ the irradiation} of {HEAD ~ the thin layer} with laser light for sintering are conducted repeatedly 
The extension of the powder material for sintering to form the thin layer and { TAIL ~ the irradiation } of { HEAD ~ the thin layer } with laser light for sintering are conducted repeatedly
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH