Thread:Vaculity/@comment-27131300-20151103023526/@comment-27131300-20151103200112

The Twin Blades where released on November of 2009 acording to this update here:

http://wikiwiki.jp/getamped-2/?%A5%A2%A5%AF%A5%BB%A5%B5%A5%EA%A5%B3%A5%E1%A5%F3%A5%C8

More specifically, this update: The line says that they will add the Twin Blades to the list of accessories.
 * 双神刀「月歌・謳華」を暫定的に追加しました. --  編集Ⅱ?  2009-11-26 (木) 15:31:51

The update was made on November 26, 2009, and it's shown that the updates of the wiki back then were pretty frequent when accs got released back then. So in conclusion, yes, it was released on November of that year.