| http://www.w3.org/ns/prov#value | - The method according to claim 18, the electromagnetically lossy filler material including a ferrimagnetic filler comprising spinel ferrite having a general formula (AaO)1-x(BbO)xFe2O3, where Aa and Bb are divalent metal cations comprising Ba, Cd, Co, Cu, Fe, Mg, Mn, Ni, Sr or Zn and x is a fractional number on the interval [0,1). 23.
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