| http://www.w3.org/ns/prov#value | - These exterior mirrors cooperate with the ring segments to direct the beam to various locations on the disc andthus form a part of the optical paths through the system.As the disc elements are rotated, a continuous, stationary beam of light from a source such as a laser strikes the reflective and open segments of one or more discs for reflection by the disc or passage therethrough in selected path
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