User blog comment:SlyCooperFan1/Falken Factory?/@comment-34452963-20120805011051/@comment-1824272-20120805012914

None of that really has any proof backing it. In fact, the engines were most likely created at the hangar in Mission 12B, because the enemies said so.

As for the one at Grunder Industries, that was probably the TLS, since Osea is the only country to have it (not including Belka, who had to give up the tech to Osea).