On December 30, 1960, Eskimo Pie Corporation (Eskimo) (defendant) entered an integrated contract granting Whitelawn Dairies, Inc. (Whitelawn) (plaintiff) the right to manufacture ice cream products bearing Eskimo wrappers and labels, and granting Supermarket Advisory Sales, Inc. (SAS) the right to purchase and sell Eskimo products in the New York City (NYC) Metropolitan Area. The contract provided that Whitelawn and SAS would have the “non-exclusive” right to purchase and sell Eskimo products. Beginning in 1962 and 1963, Eskimo began selling its own products in the NYC Metropolitan Area and granted other manufacturers and distributors the right to make and sell its products. This led to mutual claims of breach of contract among the parties. At trial, Whitelawn and SAS sought to introduce parol evidence that the term “non-exclusive” essentially meant “exclusive,” subject to a few exceptions. According to Whitelawn and SAS, the parties agreed not to include a clause expressly limiting Eskimo’s ability to sell its own products and grant licenses to other companies, with the understanding that the term “non-exclusive” would encapsulate that meaning. Eskimo argued that parol evidence was barred.