CN Eras in Portugal

1993-1999: Checkerboard
1999-2001/2002: European Powerhouse/Squares
2001/2002-May 7th 2005: Blocks
May 7th 2005-April 20th 2006: Blocks revised
April 21st 2006-April 2009: City
April 2009-December 6th 2010: Arrow
December 7th 2010-present: CHECK it