California Code, Revenue and Taxation Code - RTC § 6376

(a) From December 1, 1989 to December 31, 1990, there are exempted from 5 percent of the taxes imposed by this part, the gross receipts from the sale of and the storage, use, or other consumption in this state of material, fixtures, and supplies if the sale, storage, use or other consumption in this state of the material, fixtures, or supplies are obligated pursuant to an engineering construction project contract or a building construction contract entered into for a fixed price prior to the effective date of this section.

(b) From December 1, 1989 to December 31, 1990, inclusive, there is exempted from 5 percent of the taxes imposed by this part, a lease of tangible personal property which is a continuing sale and purchase of that property for any period of time for which the lessor is obligated to lease the property for an amount fixed by the lease prior to the effective date of this section.

(c) For the purposes of this section, the sale or lease of tangible personal property shall be deemed not to be obligated pursuant to a contract or lease for any period of time for which any party to the contract or lease has the right to terminate the contract or lease upon notice, whether or not that right is exercised.