548 F. Supp. 347 (N.D. Ill. 1982)
The case of National Presto Industries, Inc. v.
What is the appropriate method for interpreting ambiguous terms within a contract when extrinsic evidence is substantive?
When interpreting ambiguous contract terms, the court may consider extrinsic evidence to determine the intent of the parties. Ambiguities are often construed against the drafter of the contract ('contra proferentem'), particularly if the language used in the contract is unclear and the drafter is considered to have had better knowledge or resources to avoid ambiguities.
The court held that the ambiguous terms in the contract should be interpreted in light of the parties' prior communications and dealings, which favored National Presto's interpretation of the disputed terms.
This case underscores the importance of clarity in contract drafting and provides a framework for resolving ambiguities through the use of extrinsic evidence. It highlights the principle that the drafting party bears the responsibility to ensure precision in contract terms, serving as a cautionary tale for legal practitioners in drafting comprehensive agreements.