| http://www.w3.org/ns/prov#value | - Especially preferred in this arrangement is an embodiment in which two lenses 83 and 83' are placed equally distant from the center on a diameter of rotating disk 81 so that with a suitable synchronization of disk 81 and of deflection mirrors 57 and 58 (or of the electrooptical deflectors) a lens 83 or 83' is always rotated exactly into beam 61 and 62 or 10 returned to a beginning position A to fo
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