Seiko Epson Corporation ("Epson") today announced that a joint development effort with NGK Insulators, Ltd. ("NGK") has succeeded in developing the smallest*1 gyro-sensor of its kind in the world. The XV-3500CB, as the new gyro-sensor is being called, is scheduled to enter volume production in December 2004 and represents Epson's first salvo in a battle to expand the scope of its quartz crystal device business.