http://www.system16.com/konami/hrdw_contra.html

The third game, Kontora... why do you say it's a bootleg? Konami did release the game under that name. The Japanese NES version of the game is called Gryzor and has the same kanji in the title screen; and the subtitle in the arcade title says "Kontora" in Katakana [a script used to write foreign words].

Unless I misunderstood everything.