1.  Other professions.  A person licensed in this State under any other provision of law from engaging in the practice for which the person is licensed;  

2.  Federal Government employees.  An officer or employee of the Federal Government while engaged within this State in the practice of land surveying for the Federal Government;  

3.  Interstate commerce corporation employees.  An officer or employee of a corporation engaged in interstate commerce as defined in the Act of Congress entitled "An Act to Regulate Commerce" approved February 4, 1887, as amended, or in interstate communication as defined in the Act of Congress entitled "Communications Act of 1934" approved June 9, 1934, while working solely as an employee of that corporation, as long as an officer or employee of that corporation customarily in responsible charge of the surveying work of that corporation within this State is licensed under this chapter; or  

4.  Unlicensed person.  A person working under the responsible charge of a professional land surveyor.