RULE 46. Marking of premises and equipmentEvery person making a declaration under rule 44 shall, to the satisfaction of the proper officer, paint and keep in a large and distinct character upon some convenient and conspicuous part of the outside of such building, place or vessel, the distinguishing mark shown in such declaration, and from time to time and when occasion requires or when requested by the Commissioner shall renew the mark so long as the declaration thereof remains uncancelled, so that each letter or number so painted may be easily and distinctly observed and known by an officer, and whenever any such person uses or employs, in any declared building or place, any fixed pipe, he shall, when required by the Commissioner by a written notice, paint and keep painted every such pipe throughout its whole length and over its whole exterior surface with distinct oil colours to the satisfaction of the proper officer. And all pipes or parts of pipes used for the same purpose shall be painted in the same colour.