Where it comes from
The line in the source
"productTitle": "拡張パック「フロンティアの鼓動」", "releaseDate": "2009年 3月 6日（金）", "description": "カード／11枚(うち、キラカード1枚)" Explore / Figure
Record
JP expansion-pack release date, 6 March 2009 | 2009 | year to February 2010 (Mar 2009-Feb 2010) | print-year Apr 2008-Mar 2009
6 March 2009 6 March 2009 | 2009 | year to February 2010 (Mar 2009-Feb 2010) | print-year Apr 2008-Mar 2009
FiledTaken from a filing, a registry or the company’s own published page.
Found in one pass only. The research team reads every source twice, independently; this record turned up in one reading but not the other, so treat it as less certain than its grade.