Wednesday, January 24, 2018 T 282/12 - Partial priority and "the first application": partial first application

May a priority application and an even earlier application filed by the same applicant partially relate to the same invention, just as the priority application and a patent claiming priority therefrom may partially relate to the same invention (whereby the latter may benefit from partial priority under G 1/15)? If so, the priority application would be the first application in respect of only that part of the invention which is not the same as in the earlier application and priority would only be valid for that part, but not over the full scope of the claim. This was the key point in this decision.