| http://www.w3.org/ns/prov#value | - This section does not, however, apply to any of such oil and gas interests extended or renewed after July 26, 1963, unless such extension or renewal is pursuant to authority in a contract, lease, statute, regulation, city charter, ordinance or other source which authority permits no reduction of the rate of royalty or other right to share in production upon the ground of an increase in the assesse
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