| http://www.w3.org/ns/prov#value | - About 70 particles were selected at random and observed through a scanning electron microscope to show that these particles had an average particle diameter of 3.4 ??m and that each particle was a substantially spherical one having a surface formed of a 0.1 ??m thick crosslinked polystyrene coating (to be referred to as crosslinked polystyrene-coated silica fine particles" hereinafter).
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