Mich. Comp. Laws § 333.12706: Numbers, seal, and words to be placed on well drilling machine.

Sec. 12706.

A well drilling contractor shall place the registration number, including the county code number for the business location, in figures not less than 2 inches high in a conspicuous location on both sides of the contractor's well drilling machine. A seal furnished by the department designating the year the certificate of registration was issued or renewed and the words "Michigan registered water well drilling contractor" shall be affixed directly adjacent to the registration number.