| http://www.w3.org/ns/prov#value | - Further, there is a method of coordinating the relative positional relation between two lenses so as to freely control the degree of diffusion of irradiation light by driving the lenses as a method of varying the irradiation range of a lighting device by varying the posture of one or those of several component members of the lighting device, for example, as a method of utilizing the movements of t
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