| http://www.w3.org/ns/prov#value | - A first light pipe 62 is optically coupled to a source of light, such as a laser, and directs light therefrom against a reflecting-transmitting mirror-like formation 59 which may be formed integral with the wall of the housing by molding or may be secured thereto and is operable to pass a portion of the light beam emitted from the light pipe 62 to the mirror surface 54 and a second portion of said
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