A price review mechanism in a commercial contract that provides criteria for determination, procedures for hearing evidence and submissions, and references the Commercial Arbitration Act constitutes an 'arbitration' within the meaning of the Act. Where an arbitration agreement confines the arbitrators' inquiry to specified categories of prices using limiting language such as 'shall have regard only to', a party seeking a subpoena must demonstrate that the subpoenaed documents are apparently relevant to those specified categories; documents relating to a different product (raw gas rather than processed natural gas) will not satisfy the apparent relevance test without a demonstrated connection to the defined scope of the arbitration.
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