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FOREWORD <br /> Nothing contained in any API publication is to be construed as granting any right,by impli- <br /> cation or otherwise, for the manufacture, sale,or use of any method, apparatus,or product <br /> covered by letters patent.Neither should anything contained in the publication be construed <br /> as insuring anyone against liability for infringement of letters patent. <br /> This document was produced under API standardization procedures that ensure appropriate <br /> notification and participation in the developmental process and is designated as an API stan- <br /> dard.Questions concerning the interpretation of the content of this publication or comments <br /> and questions concerning the procedures under which this publication was developed should <br /> be directed in writing to the Director of Standards, American Petroleum Institute, 1220 L <br /> Street,N.W.,Washington,D.C.20005.Requests for permission to reproduce or translate all <br /> or any part of the material published herein should also be addressed to the director. <br /> Generally,API standards are reviewed and revised,reaffirmed,or withdrawn at least every <br /> five years.A one-time extension of up to two years may be added to this review cycle.Status <br /> of the publication can be ascertained from the API Standards Department,telephone(202) <br /> 682-8000. A catalog of API publications and materials is published annually and updated <br /> quarterly by API, 1220 L Street,N.W.,Washington,D.C.20005. <br /> Suggested revisions are invited and should be submitted to the Standards and Publications <br /> Department,API, 1220 L Street,NW,Washington,DC 20005,standards(,)api.org. <br /> in <br />