15-59-101. Definitions. (1) The word "import" shall include and mean to receive into any person's possession or custody first after its arrival and coming to rest at destination within the state of Montana of any cement, gypsum, gypsum plaster, stucco, wallboard, land plaster, or other products of cement or gypsum, as the same are defined in this section, shipped or transported into this state from point of origin without this state.

(2) The words "products of cement or gypsum", as used in 15-59-102, shall, in addition to the articles herein specifically enumerated, include all manufactured products into which gypsum enters as a component part to the extent of not less than 50% by weight. No double taxation of either cement, gypsum, or the products thereof is imposed by this part.