A. All derricks shall be constructed of steel, except that the derrick floors, pump house floors, pipe racks, stills, postings, walkways, mud ditches, bull wheels, calf wheels, and band wheels may be of wooden construction.
B. Each derrick shall have placed thereon a sign on which shall appear the name of the well being drilled or operated, together with the name of the permittee, the letters of which shall be at least two inches high and shall be fully visible from two opposite sides of the derrick.