| http://www.w3.org/ns/prov#value | - 20140125214SPARK PLUG ELECTRODE MATERIAL AND SPARK PLUG - A spark plug electrode material containing nickel, silicon, and copper, the electrode material, in the case of proper use, forming a nickel oxide layer made of nickel oxide grains on at least a part of its surface, the grain boundary phase of the nickel oxide grains including silicon and/or silicon oxide.05-08-2014
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