US Patent 6880826 Symbol display apparatus for game machine

A symbol display apparatus for game machine includes aligned plural reel units. Each of the reel units has double reel structure composed of an outer reel and an inner reel. Of two half symbols made by dividing a single complete symbol, one half symbol is disposed in a periphery of the inner reel, and the other half symbol is disposed in a periphery of the outer reel. When the corresponding half symbols disposed separately in the inner and outer reels stop together on the same winning line, a composite symbol is formed. The composite symbol is used as a hit symbol which makes up a winning symbol combination.