There are at least two artists with the same name:
1. Dull Knife was a 70s German krautrock band that released one album, Electric Indian, in 1971 .
Line-up: Gottfried Janko (Keyboards, Vocals), Martin Hesse (Bass), Klaus Zaake (Drums, Percussion), Christian Holik (Guitar)
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2. Dull Knife (Brighton, UK) formed at the back end of 2013 after a few living room jams. George and Jack met through 60s psych band The Pretty Things, they make up the rhythm section and have a mutual interest in delta blues, 60s garage psych and outlaw country. Most of their repertoire was penned on the road in hotel rooms and in Jack's living room.