| http://www.w3.org/ns/prov#value | - Corona needles 36 are electrically grounded by connection through the wires 35, support grid 37, and inlet duct 31. - The depending ends of some or all of the corona needles are provided with bars or strands 38 of a dielectric material, such as aluminum oxide, to provide support for subjacent repulser corona needles 40 positioned intermediate the ionizing section A and the collector section B of t
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