N.H. Rev. Stat. Ann. § 339-B:6

No person shall mix, blend or compound the liquid fuels, lubricating oils, greases or similar products of a manufacturer or distributor with the products of any other manufacturer or distributor, or adulterate the same, and expose, offer for sale, or sell such mixed, blended or compounded products under the trade name, trademark or name or other distinguishing mark of either of said manufacturer or distributor, or as the unadulterated products of such manufacturer or distributor; provided, however, that nothing herein shall prevent the lawful owner thereof from applying its own trademark, trade name, or symbol to any product or material.