Prominent in the mid to late '80s, SM-70 was a German hardcore punk band, one of Germany's precursors to grindcore and powerviolence. Their blinding speed took cues from Siege and Deep Wound. They could be compared to bands like Septic Death and Ripcord. They have two EPs for free download on 7inchpunk here: http://www.7inchpunk.com/?s=sm-70

SM-70 on Last.fm.