| http://www.w3.org/ns/prov#value | - Further, preferably, the window 7 or the ball lens 9 is formed by any one of the materials such as silicon, diamond, sapphire, silica, magnesium oxide, and calcium fluoride similarly to the sealing chips 4a, 4b 4c and 4d to seal the leading end of the laser probe 1.
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