Just a bunch I think I haven't seen mentioned yet. Most of these and the ones already mentioned actually sit astride 1970 but I would guess that is not a hard cut-off date for your purpose.
The Nice
Soft Machine
Gong (the Kevin Ayers era)
Colosseum
Ten Years After
The Crazy World of Arthur Brown
Edgar Broughton Band
Pink Fairies
Tyrannosaurus Rex
The Nice
Soft Machine
Gong (the Kevin Ayers era)
Colosseum
Ten Years After
The Crazy World of Arthur Brown
Edgar Broughton Band
Pink Fairies
Tyrannosaurus Rex