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44C H A P T E R I Iproduction, or small production; nor energy for use in emergencies resultingfrom interruptions in the public power grid service. Also not included is theimport of power by individuals or entities exclusively for self-supply;• Generation of nuclear power;• Radioactive minerals;• Telegraphs and radiotelegraphy;• Mail service;• Issuance of banknotes and minting;• Control, supervision, and oversight of ports, airports, and heliports;b) Activities reserved for Mexicans. The economic activities and companies mentionedbelow are reserved exclusively for Mexicans or Mexican companies having a clausein their bylaws excluding foreigners:• National land transport of passengers, tourists, and cargo, not including messengerand parcel services;• Retail sale of gasoline and distribution of liquid petroleum gas;• Provision of radio broadcasting and other radio and television services, otherthan cable television;• Credit unions;• Development bank institutions, in accordance with the applicable law;• The provision of professional and technical services expressly indicated in theapplicable laws.Foreign investment is not allowed in the above-mentioned activities and companies,directly or through trusts, agreements, partnership agreements or bylaws, pyramidschemes, or any other mechanism that grants them any control or share.Notwithstanding the above, there is a mechanism through which foreign investmentcan participate in certain activities reserved for Mexicans: neutral investment, which isanalyzed in Point 1.5 of this chapter.1.4.2. Activities and acquisitions subject to a specific regulationThere are certain economic activities and companies in which foreign investment is notexcluded but is limited to a certain proportion, ranging from 10 to 49 percent. Thereare also certain sectors in which even when the foreign investment is limited to 49 percent,it is possible to surpass such percentage with an authorization of the National ForeignInvestment Commission (Comisión Nacional de Inversiones Extranjeras, CNIE).In order to determine the percentage of foreign investment in the economic activitiessubject to maximum limits of investment, the foreign investment made in such activitiesindirectly through Mexican companies with a majority of Mexican capital is not counted,provided the latter are not controlled by the foreign investment.