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<http://webisa.webdatacommons.org/prov/32931763>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/201884967> .
<http://webisa.webdatacommons.org/201884967>	<http://www.w3.org/ns/prov#value>	"g the image of the site displayed on the providing means such as a display device, the tube inserting operation can be carried out more easily.In this arrangement, the light receiving and image acquiring means and the illumination means are preferab" .