| http://www.w3.org/ns/prov#value | - Patent US4298672 - Electrography - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsDisclosed is a positively charged developer comprised of a toner and an alkyl pyridinium compound and its hydrate of the formula ##STR1## wherein A is an anion selected from halides such as chlorine, bromine, iodine, sulfate, sulfonate, nitrate and borate, an
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