(a) Persons or associations of persons who are citizens of the United States or who have declared their intention of becoming such, or who are citizens of any country, dependency, colony, or province, the laws, customs, and regulations of which permit the grant of similar or like privileges to citizens of the United States.

(b) Any corporation or corporations organized and existing under and by virtue of the laws of the United States or of any state or territory thereof; or any corporation or corporations 90 per cent or more of the shares of which are owned by persons eligible to hold a lease or permit under subdivision (a) or (c) of this section; or any corporation or corporations 90 per cent or more of the shares of which are owned either by a corporation eligible to hold a lease or permit hereunder, or by any combination of such eligible persons or corporations, or both.

(c) Any alien person entitled thereto by virtue of any treaty between the United States and the nation or country of which the alien person is a citizen or subject.