A. There are exempted from the taxes imposed by this Title the gross receipts from the sale of, and the storage, use or other consumption in the County of, tangible personal property used for the performance of a written contract entered into prior to July 1, 1967.
B. There are exempted from the additional taxes imposed by amendment to this Chapter the gross receipts from the sale of, and the storage, use of other consumption in the County of, tangible personal property used for the performance of a written contract for construction entered into prior to May 1, 1981. (Ord. 106 §5(N), 1989)