Just some ideas, if these bands were already mentioned then forgive me.

Annihilator (Can)
Bathory (old) (Swe)
Crossfire (Bel)
Darkness (Ger)
Death In Action (Ger)
Devastation (USA)
Defiance (USA)
Iron Angel (Ger)
Korrozia Metalla (Rus)
Korzus (Bra)
Massacra (Fra)
Merciless Death (USA)
Onslaught (UK)
Sacrifice (Can)
Toranaga (UK)

More to come...whenever I feel like it.