AMSTERDAM, Dec. 20 -- ASML Holding NV has sold Tinsley Laboratories Inc. to SSG Precision Optronics Inc. for an undisclosed sum. Tinsley was a unit of Silicon Valley Group (SVG), which ASML bought earlier this year. ASML won approval from the US government to buy SVG only after agreeing to sell Tinsley, some of whose technology is used for spy satellites. Massachusetts- based SSG is privately owned and specializes in space-based and other high-performance optical subsystems. It has around 200 employees.