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OPTICAL SCANNING APPARATUS EMPLOYING TWO FOCUSING ELEMENTS MOVING PARALLEL TO A DIFFUSELY REFLECTING SURFACE AND WITH A SPACING PARALLEL TO A SPACING BETWEEN A LIGHT SOURCE AND A DETECTOR OR VIRTUAL IMAGE THEREOF
OPTICAL SCANNING APPARATUS EMPLOYING TWO FOCUSING ELEMENTS MOVING PARALLEL TO A DIFFUSELY REFLECTING SURFACE AND WITH A SPACING PARALLEL TO A SPACING BETWEEN A LIGHT SOURCE AND A DETECTOR OR VIRTUAL IMAGE THEREOF