| http://www.w3.org/ns/prov#value | - retro-reflector having a characteristic of providing a conjugate optical path leading to said eye of a viewer, a beamsplitter carried by the mounting structure in position to receive light from the focusing optics and image source and to direct the light toward said retro-reflector, and said mounting structure including means for holding said beamsplitter and focusing optics with respect to the h
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