Mich. Comp. Laws § 339.5931

Sec. 931. (1) An individual may operate a boiler and associated auxiliaries without obtaining a registration under this article. (2) An individual or his or her employer shall not use the terms "registered boiler operator", "certified boiler operator", "registered stationary engineer", "certified stationary engineer", "low pressure registered boiler operator", "low pressure certified boiler operator", "high pressure registered boiler operator", "high pressure certified boiler operator", "third-class registered stationary engineer", "third-class certified stationary engineer", "second-class registered stationary engineer", "second-class certified stationary engineer", "first-class registered stationary engineer", "first-class certified stationary engineer", or any other name, style, or description that indicates that the individual is registered unless the individual holds a registration under this article. (3) An individual who participates in an approved apprenticeship program, a qualified technical training program, or a qualified training program may use the title "apprentice certified boiler operator" or "apprentice certified stationary engineer". (4) An individual who is registered under this article shall only use 1 of the titles described in subsection (2) or the abbreviation "R.B.O.", "C.B.O.", "R.S.E.", or "C.S.E.". (5) An individual who is applying for a registration under this article must be at least 18 years old and meet the requirements under article 2.