Coverage. This bulletin covers items of obsolete equipment which were previously included in Spec 6A in Appendixes G@ H. I. J. and M of the Eleventh Edition. Policy. American Petroleum Institute (API) publications are published as an aid to procurement of standardized equipment and materials. These publications are not intended to inhibit purchasers and producers from purchasing or producing products made to specifications other than API. Nothing contained in any API publication is to be construed as granting any right. by implication or otherwise. for the manufacture@ sale@ or use in connection with any method. apparatus or product covered by letters patent. nor as insuring anyone against liability for infringement of letters patent. API publications may be used by anyone desiring to do so@ and every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them. However. the Institute makes no representation. warranty or guarantee in connection with the publication of any API publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from their use@ for any violation of any federal. state or municipal regulation with which an API publication may conflict. or for the infringement of any patent resulting from the use of an API publication.