Section eleven of the same Act is hereby amended to read as follows: "SEC. 11. Grades.
Section 3
SEC. 3. Section eleven of the same Act is hereby amended to read as follows: "SEC. 11. Grades.—Certificates of registration for the practice of mechanical engineering shall be of three grades and in the order of rank as follows: (1) professional mechanical engineer, (2) mechanical engineer, and (3) certified plant mechanic."