"Whatever may have been the purchaser's rights under this car purchase order, the order was superseded by the conditional sales contract signed the next night. It was the intent of the parties that all prior negotiations be integrated in that contract, and, as such, the contract became the final and only effective expression of the parties. Restatement, Contracts, 307, § 228; Schnitzer v. Panhandle Lbr. Co. (1942), 14 Wn.2d 434, 128 P.2d 501."
First, whatever may have been the purchaser's rights under this car purchase order, the order was superseded by the conditional sales contract signed the next night. It was the intent of the parties that all prior negotiations be integrated in that contract, and, as such, the contract became the final and only effective expression of the parties. Restatement, Contracts, 307, § 228; Schnitzer v. Panhandle Lbr. Co. (1942), 14 Wn.2d 434, 128 P.2d 501. Second, if we accept the purchaser's contention that the documents should be construed together, the seller waived the condition of written acceptance when he delivered the Buick to the purchaser on February 18th, and such delivery was as unequivocal an acceptance of the order as a written confirmation. Pillsbury Flour Mills v. Independent Bakery (1931), 165 Wn. 360, 5 P.2d 517; 8 P.2d 430; 10 P.2d 975.
They are sustained only when the contract of the parties shows a clear intention to provide for them. Were there any doubt about the meaning of the words in this deed, it properly would be resolved against the grantor and in favor of the grantees. Schnitzer v. Panhandle Lbr. Co., 14 Wn.2d 434, 439, 128 P.2d 501 (1942). Nor should a construction be adopted which results in the conclusion that the words in a deed intend a condition for reversion, rather than a covenant, unless that construction is compelled by the language of the document itself.