| http://www.w3.org/ns/prov#value | - (b) To administer oaths, summon the parties to a controversy, issue subpoenas requiring the attendance and testimony of witnesses or the production of such books, paper, contracts, records, statement of accounts, agreements, and other documents as may be material to a just determination of the matter under investigation, and to testify in any investigation or hearing conducted in pursuance of this
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