I'd like to suggest the '70s German band Eruption for inclusion.
Eruption was based in Berlin, and their only release was a self-titled LP released in 1970. The line-up consisted of Klaus Freudigmann, Conrad Schnitzler and Wolfgang Seidel, although they were affiliated with Manuel Gottsching, Klaus Schulze and Hartmut Enke, all of whom would later go on to form Ash Ra Tempel. Dieter Serfas (Embryo) and members of Agitation Free would also join the band.
The music bears resemblences to Kluster and the cosmic soundscapes of early Tangerine Dream, with little structure and many experimental noises. Sounding like many of the groups that it eventually blossomed into, I believe that Eruption has a rightful place in the Krautrock section.
This LP was reissued in 2006 by the Italian label QBico, although it was done so in extremely limited quantities. I have found a video containing some of Eruption's music, and I would be more than happy to upload some more music if anyone else is interested. Drop me a PM.