This specification is dimensional only@ applies to new material@ and covers the following items of production equipment: Polished rods and polished-rod liners Stuffing boxes and pumping tees. Pull-rods and couplings. Screen-pipe and slotted-pipe openings. Nothing contained in this specification is to be construed as granting any right@ by implication or otherwise@ for 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. This specification is for the convenience of purchasers and manufacturers in ordering and producing miscellaneous production equipment and is not intended to inhibit purchasers and producers from purchasing and producing miscellaneous production equipment meeting specifications other than those contained herein no is it intended in any way to inhibit purchasers from purchasing miscellaneous production equipment from companies not authorized to use the API monogram.