50-74-203. Qualifications of boiler inspectors. A person is not eligible to hold the office of inspector of boilers and steam engines who has not had at least 10 years of actual experience in the operation of steam engines, steam boilers, and steam machinery and who has not held for at least 3 years immediately preceding the person's appointment a first-class stationary engineer's license of the state of Montana or who is directly or indirectly interested in the manufacture or sale of boilers or steam machinery or any patented article required to be sold relating boilers or steam machinery.