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<http://webisa.webdatacommons.org/prov/396589886>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/42997610> .
<http://webisa.webdatacommons.org/42997610>	<http://www.w3.org/ns/prov#value>	"FIG. 2 shows only devices such as a measurement devices and a gas discharge blower 40 installed in right-end gas discharge channel, while these devices are installed in the respective gas discharge channels 46, and a mechanism installed in other gas discharge channels are omitted." .