In one case, for example, Black and White Taxicab Co. v. Brown and Yellow Taxicab Co. 276 U.S. 518 (1928), the Brown and Yellow Cab Company, a Kentucky corporation, sought to create a business association with the Louisville and Nashville Railroad, where Brown and Yellow would have a monopoly on soliciting passengers of the railroad, effectively eliminating the competition, the Black and White Cab Co.
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Norman Spaulding, a professor of civil law, has treated the framing hammer as a discursive metaphor for the Erie doctrine of United States law's reversal of the case Swift v. Tyson, which decided whether federal courts, when deciding matters not specifically addressed by the state legislature, had the authority to develop a federal common law.