This HTML5 document contains 4 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

PrefixNamespace IRI
n4google.
isaphttp://webisa.webdatacommons.org/prov/
isahttp://webisa.webdatacommons.org/
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
provhttp://www.w3.org/ns/prov#
xsdhhttp://www.w3.org/2001/XMLSchema#
Subject Item
isa:214011686
rdf:type
prov:Entity
prov:value
Heretofore, considerable difficulty has been encountered in connection with the commercial cleaning of air ducts as, for example, hot air furnace ducts, air conditioning ducts, ventilating ducts and the like such as are commonly employed in large office buildings, factories, foundries, laundries, and other commercial establishments too numerous to mention.
prov:wasQuotedFrom
n4:com
Subject Item
isap:145763856
prov:wasDerivedFrom
isa:214011686