| http://www.w3.org/ns/prov#value | - or DC current in an ultrahigh vacuum, e.g. 10-7 to 10-10 Torr using specially adapted equipment for continuous or automated production and collection through special ultrahigh vacuum seals and valves of predominantly rhombohedral graphite particles which can be further separated into still more homogeneous populations of particles ranging in size from 3 to 50 A and from 50 to 100 A for example by
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