| http://www.w3.org/ns/prov#value | - a preferred construction; FIG. 5 is a schematic block diagram illustrating the logic sequence and motor logic control as shown in block diagram in FIG. 1; FIG. 6 is a view diagrammatically illustrating a drive mechanism for moving of the beam across the scanning paths; FIG. 7 is a view taken generally on line 66 of FIG. GENERAL DESCRIPTION Referring now to the drawings and particularly FIG. 1, a b
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