Drennan v. Star Paving Co. (333 P.2d 757 (Cal. 1958)) established the Drennan Rule which says that, held implicit in the subcontractor’s bid is a subsidiary promise to keep the bid open for a reasonable time after award of the prime contract to give the general contractor an opportunity to accept the offer on which he relied in computing the prime bid. But sometimes the opposite can happen. For example, in the case of Southern California Acoustics Co. v. C.V. Holder (71 Cal.2d 719, 79 Cal.Rptr. 319, 456 P.2d 975 (Cal. 1969) SC Acoustics offered a bid, thought they’d been accepted by the prime contractor, Holder, and so refrained from bidding on other jobs. Holder later notified them that the acceptance of their bid had been an error. The Court found for Holder, saying that there was no contract, and that the Drennan Rule does not protect subconctractors the way it protects main contractors.