Aug 1 (Reuters) - Merck KGaA:: *MERCK KGAA - MERCK COMPLETES SALE OF SURFACE SOLUTIONS TO GNMI *MERCK KGAA - MERCK SELLS SURFACE SOLUTIONS BUSINESS TO GNMI FOR EUR 665 MILLION *Further company coverage: MRCG.DE * (Gdansk Newsroom) * ((gdansk.newsroom@thomsonreuters.com; +48 58 7696600;))