| http://www.w3.org/ns/prov#value | - The distance between any of cathode edges 68 a, 68 h, 68 c and a point on the inside surface of the plasma channel, for example point 64, must be less than or equal to the distance between any of cathode edges 68 a, 68 b, 68 c and any other surface onto which an electric spark may terminate, such as the inside surface of plasma chamber 26 and the edge of the cathode insulator closest to anode 66.
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