<http://webisa.webdatacommons.org/104513440>	<http://www.w3.org/ns/prov#value>	"FIGS. 8A and 8B are partial cross-sectional views showing the optical path of an observation system and a visual line detecting system in an embodiment of the present invention, while FIG. 9 is a partial plan view of the systems shown in FIGS. 8A and 8B, and FIGS. 10 and 11 are schematic views showing the mode of use when the device of the present invention is mounted on the head of the observer." .
<http://webisa.webdatacommons.org/prov/151275828>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/104513440> .
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