This specification covers portable masts@ which shall be defined as any mast structure suitable for oil-well or gas-well drilling or servicing. The guyed portable mast is erected to its working position as a unit@ is not normally dismantled into components for moving@ and is provided with guylines as essential load-carrying members. The free-standing portable mast is erected to its working position as a unit@ is normally dismantled into relatively large components for moving@ and does not require guylines as essential load-carrying members. 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 masts. It is not intended to inhibit purchasers and producers from purchasing and producing masts meeting specifications other than those contained herein; nor is it intended in any way to inhibit purchasers from purchasing masts from companies not authorized to use the API monogram.