| http://www.w3.org/ns/prov#value | - in a sample; and indication means responsive to the microprocessor output for providing indication of the presence of a PCB in a sample, said microprocessor further including means for determining with high certainty that a sample contains a PCB, for determining that a sample may contain a PCB and for determining with high certainty that a sample does not contain a PCB, said microprocessor furthe
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