314.5 Elevators.

The component parts of an elevator constitute building materials within the meaning of the act. The sale of elevator components to contractors, builders or landowners for use in the form of real estate is, therefore, a retail sale notwithstanding that the purchaser constructs therefrom an elevator which ultimately becomes the property of others. Where the manufacturer of elevator components uses the products of his manufacture in the performance of a construction contract, he is defined under the statute as the user of such equipment and liable for the tax based upon the reasonable and fair market price thereof at the time and place where such property is used by him.