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<http://webisa.webdatacommons.org/prov/89312683>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/80856037> .
<http://webisa.webdatacommons.org/prov/15616353>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/80856037> .
<http://webisa.webdatacommons.org/80856037>	<http://www.w3.org/ns/prov#value>	"Topics such as fire and extinguishers, water hardness and treatment, cold and hot water distribution systems, refrigeration and heating, ventilation and air conditioning and elucidated." .